1
|
Herrera G, Robert A, Gonzalez S, Schoeffmann P, Tamion A, Tournus F, Bardotti L, Boisron O, Albin C, Blanchard N, Canero-Infante I, Romeo PR, Canut B, Otero E, Ohresser P, Wilhelm F, Rogalev A, Bugnet M, Le Roy D, Dupuis V. Finite size effects on the metamagnetic phase transition in a thick B2 FeRh nanocluster film. NANOSCALE 2024. [PMID: 38856701 DOI: 10.1039/d4nr00873a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2024]
Abstract
FeRh alloys in the CsCl-type (B2) chemically ordered phase present an antiferromagnetic to ferromagnetic order transition around 370 K observed in bulk and continuous films but absent in nanoclusters. In this study, we investigate the thermal magnetic behavior of a thick film composed of assembled FeRh nanoclusters preformed in the gas phase. This work reveals a broad and asymmetric metamagnetic transition with a consequent residual magnetization at low temperature. Due to the coexistence of different grain sizes in the sample, we confront the results with a description that involves two populations of B2-FeRh particles, and the existence of a discriminating size below which the magnetic order transition does not take place.
Collapse
Affiliation(s)
- Guillermo Herrera
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France.
| | - Anthony Robert
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France.
| | - Sara Gonzalez
- Institut des Nanotechnologies de Lyon, CNRS UMR 5270 ECL INSA UCBL CPE, F-69621 Villeurbanne Cedex, France
| | | | - Alexandre Tamion
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France.
| | - Florent Tournus
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France.
| | - Laurent Bardotti
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France.
| | - Olivier Boisron
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France.
| | - Clément Albin
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France.
| | - Nicholas Blanchard
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France.
| | - Ingrid Canero-Infante
- Institut des Nanotechnologies de Lyon, CNRS UMR 5270 ECL INSA UCBL CPE, F-69621 Villeurbanne Cedex, France
| | - Pedro Rojo Romeo
- Institut des Nanotechnologies de Lyon, CNRS UMR 5270 ECL INSA UCBL CPE, F-69621 Villeurbanne Cedex, France
| | - Bruno Canut
- Institut des Nanotechnologies de Lyon, CNRS UMR 5270 ECL INSA UCBL CPE, F-69621 Villeurbanne Cedex, France
| | - Edwige Otero
- Synchrotron SOLEIL, L'Orme de Merisiers, 91190 Saint-Aubin, France
| | | | - Fabrice Wilhelm
- European Synchrotron Radiation Facility, CS 40220, F-38043 Grenoble, France
| | - Andrei Rogalev
- European Synchrotron Radiation Facility, CS 40220, F-38043 Grenoble, France
| | - Matthieu Bugnet
- CNRS, INSA Lyon, Université Claude Bernard Lyon 1, MATEIS, UMR5510, F-69621 Villeurbanne, France
| | - Damien Le Roy
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France.
| | - Véronique Dupuis
- Institut Lumière Matière, UMR 5306, Université Lyon 1-CNRS, Université de Lyon, F-69622 Villeurbanne Cedex, France.
| |
Collapse
|
2
|
Curti L, Prado Y, Michel A, Talbot D, Baptiste B, Otero E, Ohresser P, Journaux Y, Cartier-Dit-Moulin C, Dupuis V, Fleury B, Sainctavit P, Arrio MA, Fresnais J, Lisnard L. Room-temperature-persistent magnetic interaction between coordination complexes and nanoparticles in maghemite-based nanohybrids. NANOSCALE 2024; 16:10607-10617. [PMID: 38758111 DOI: 10.1039/d4nr01220h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
Maghemite nanoparticles functionalised with Co(II) coordination complexes at their surface show a significant increase of their magnetic anisotropy, leading to a doubling of the blocking temperature and a sixfold increase of the coercive field. Magnetometric studies suggest an enhancement that is not related to surface disordering, and point to a molecular effect involving magnetic exchange interactions mediated by the oxygen atoms at the interface as its source. Field- and temperature-dependent X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) studies show that the magnetic anisotropy enhancement is not limited to surface atoms and involves the core of the nanoparticle. These studies also point to a mechanism driven by anisotropic exchange and confirm the strength of the magnetic exchange interactions. The coupling between the complex and the nanoparticle persists at room temperature. Simulations based on the XMCD data give an effective exchange field value through the oxido coordination bridge between the Co(II) complex and the nanoparticle that is comparable to the exchange field between iron ions in bulk maghemite. Further evidence of the effectiveness of the oxido coordination bridge in mediating the magnetic interaction at the interface is given with the Ni(II) analog to the Co(II) surface-functionalised nanoparticles. A substrate-induced magnetic response is observed for the Ni(II) complexes, up to room temperature.
Collapse
Affiliation(s)
- Leonardo Curti
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, F-75005, Paris, France.
| | - Yoann Prado
- Sorbonne Université, CNRS, Laboratoire de Physicochimie des Électrolytes et Nanosystèmes interfaciaux, PHENIX, F-75005, France.
| | - Aude Michel
- Sorbonne Université, CNRS, Laboratoire de Physicochimie des Électrolytes et Nanosystèmes interfaciaux, PHENIX, F-75005, France.
| | - Delphine Talbot
- Sorbonne Université, CNRS, Laboratoire de Physicochimie des Électrolytes et Nanosystèmes interfaciaux, PHENIX, F-75005, France.
| | - Benoît Baptiste
- CNRS, Sorbonne Université, IRD, MNHN, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, F-75005, Paris, France.
| | - Edwige Otero
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France
| | - Philippe Ohresser
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France
| | - Yves Journaux
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, F-75005, Paris, France.
| | | | - Vincent Dupuis
- Sorbonne Université, CNRS, Laboratoire de Physicochimie des Électrolytes et Nanosystèmes interfaciaux, PHENIX, F-75005, France.
| | - Benoit Fleury
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, F-75005, Paris, France.
| | - Philippe Sainctavit
- CNRS, Sorbonne Université, IRD, MNHN, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, F-75005, Paris, France.
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France
| | - Marie-Anne Arrio
- CNRS, Sorbonne Université, IRD, MNHN, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, F-75005, Paris, France.
| | - Jérôme Fresnais
- Sorbonne Université, CNRS, Laboratoire de Physicochimie des Électrolytes et Nanosystèmes interfaciaux, PHENIX, F-75005, France.
| | - Laurent Lisnard
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, F-75005, Paris, France.
| |
Collapse
|
3
|
Sartori K, Lopez-Martin R, Choueikani F, Gloter A, Grenèche JM, Begin-Colin S, Taverna D, De Toro JA, Pichon BP. Magnetic anisotropy engineering in onion-structured metal oxide nanoparticles combining dual exchange coupling and proximity effects. NANOSCALE ADVANCES 2024; 6:2903-2918. [PMID: 38817437 PMCID: PMC11134230 DOI: 10.1039/d3na01108a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Accepted: 03/19/2024] [Indexed: 06/01/2024]
Abstract
A series of exchange-coupled magnetic nanoparticles combining several magnetic phases in an onion-type structure were synthesized by performing a three-step seed-mediated growth process. Iron and cobalt precursors were alternatively decomposed in high-boiling-temperature solvents (288-310 °C) to successively grow CoO and Fe3-δO4 shells (the latter in three stages) on the surface of Fe3-δO4 seeds. The structure and chemical composition of these nanoparticles were investigated in depth by combining a wide panel of advanced techniques, such as scanning transmission electron microscopy (STEM), electron energy-loss spectroscopy-spectrum imaging (EELS-SI), 57Fe Mössbauer spectrometry, and X-ray circular magnetic dichroism (XMCD) techniques. The size of the nanoparticles increased progressively after each thermal decomposition step, but the crystal structure of core-shell nanoparticles was significantly modified during the growth of the second shell. Indeed, the antiferromagnetic CoO phase was progressively replaced by the CoFe2O4 ferrimagnet due to the concomitant processes of partial solubilization/crystallization and the interfacial cationic diffusion of iron. A much more complex chemical structure than that suggested by a simple size variation of the nanoparticles is thus proposed, namely Fe3-δO4@CoO-CoFe2O4@Fe3-δO4, where an intermediate Co-based layer was shown to progressively become a single, hybrid magnetic phase (attributed to proximity effects) with a reduction in the CoO amount. In turn, the dual exchange-coupling of this hybrid Co-based intermediate layer (with high anisotropy and ordering temperature) with the surrounding ferrite (core and outer shells) stabilized the particle moment well above room temperature. These effects allow for the production of Fe oxide-based magnetic nanoparticles with high effective anisotropy, thus revealing the potential of this strategy to design rare-earth-free permanent nanomagnets at room temperature.
Collapse
Affiliation(s)
- Kevin Sartori
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 F-67000 Strasbourg France
- Synchrotron SOLEIL L'Orme des Merisiers, Saint Aubin - BP48, 91192 Gif-sur-Yvette France
| | - Raul Lopez-Martin
- Instituto Regional de Investigación Científica Aplicada (IRICA), Departamento de Física Aplicada, Universidad de Castilla-La Mancha 13071 Ciudad Real Spain
| | - Fadi Choueikani
- Synchrotron SOLEIL L'Orme des Merisiers, Saint Aubin - BP48, 91192 Gif-sur-Yvette France
| | - Alexandre Gloter
- Laboratoire de Physique des Solides, CNRS, Université Paris-Saclay 91400 Orsay France
| | - Jean-Marc Grenèche
- Institut des Molécules et Matériaux du Mans, IMMM, UMR CNRS-6283, Le Mans Université Avenue Olivier Messiaen, 72085 Le Mans Cedex 9 France
| | - Sylvie Begin-Colin
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 F-67000 Strasbourg France
| | - Dario Taverna
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR 7590, CNRS, Sorbonne Université 75005 Paris France
| | - Jose A De Toro
- Instituto Regional de Investigación Científica Aplicada (IRICA), Departamento de Física Aplicada, Universidad de Castilla-La Mancha 13071 Ciudad Real Spain
| | - Benoit P Pichon
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 F-67000 Strasbourg France
- Institut Universitaire de France 1 Rue Descartes 75231 Paris Cedex 05 France
| |
Collapse
|
4
|
Retegan M, Jafri SF, Curti L, Lisnard L, Otero E, Rivière E, Haverkort MW, Bleuzen A, Sainctavit P, Arrio MA. Orbital Magnetic Moment and Single-Ion Magnetic Anisotropy of the S = 1/2 K 3[Fe(CN) 6] Compound: A Case Where the Orbital Magnetic Moment Dominates the Spin Magnetic Moment. Inorg Chem 2023; 62:18864-18877. [PMID: 37942765 DOI: 10.1021/acs.inorgchem.3c02158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2023]
Abstract
The potassium hexacyanoferrate(III), K3[FeIII(CN)6], is known for its exceptional magnetic anisotropy among the 3d transition metal series. The Fe(III) ions are in the S = 1/2 low spin state imposed by the strong crystal field of the cyanido ligands. A large orbital magnetic moment is expected from previous publications. In the present work, X-ray magnetic circular dichroism was recorded for a powder sample, allowing direct measurement of the Fe(III) orbital magnetic moment. A combination of molecular multiconfigurational ab initio and atomic ligand field multiplets calculations provides the spin and orbital magnetic moments for the [FeIII(CN)6]3- isolated cluster, the crystallographic unit cell, and the powder sample. The calculations of the angular dependencies of the spin and orbital magnetic moments with the external magnetic induction direction reveal easy magnetization axes for each S = 1/2 molecular entity and the crystal. It also shows that the orbital magnetic moment dominates the spin magnetic moment for all directions. Our measurements confirm that the orbital magnetic moment contributes to 60% of the total magnetization for the powder, which is in excellent agreement with our theoretical predictions. An orbital magnetic moment greater than the spin magnetic moment is exceptional for 3d transition metal ions. The impact of crystal field strength and distortion, π back-bonding, spin-orbit coupling, and external magnetic induction was analyzed, leading to a deeper understanding of the spin and orbital magnetic anisotropies.
Collapse
Affiliation(s)
- Marius Retegan
- European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble, France
| | - Sadaf Fatima Jafri
- CNRS, Sorbonne Université, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, CNRS/SU/IRD/MNHN, 75252 Paris Cedex 05, France
- Department of Physics, University of Karachi, 75270 Karachi, Pakistan
| | - Leonardo Curti
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, FR2769, 75252 Paris Cedex 05, France
| | - Laurent Lisnard
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, FR2769, 75252 Paris Cedex 05, France
| | - Edwige Otero
- Synchrotron SOLEIL, L'Orme des Merisiers, F-91192 Saint-Aubin, France
| | - Eric Rivière
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, ICMMO, 91405 Orsay Cedex, France
| | - Maurits W Haverkort
- Institute for Theoretical Physics, Heidelberg University, Philosophenweg 19, 69120 Heidelberg, Germany
| | - Anne Bleuzen
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, ICMMO, 91405 Orsay Cedex, France
| | - Philippe Sainctavit
- CNRS, Sorbonne Université, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, CNRS/SU/IRD/MNHN, 75252 Paris Cedex 05, France
- Synchrotron SOLEIL, L'Orme des Merisiers, F-91192 Saint-Aubin, France
| | - Marie-Anne Arrio
- CNRS, Sorbonne Université, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, CNRS/SU/IRD/MNHN, 75252 Paris Cedex 05, France
| |
Collapse
|
5
|
Vélez-Fort E, Ohresser P, Silly MG, Bonvoisin J, Silly F. Structural and Magnetic Properties of a Drop-Cast C 54H 34Br 4CuO 4 β-Diketonato Complex Film on a Graphite Surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:14000-14005. [PMID: 37656672 DOI: 10.1021/acs.langmuir.3c01684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/03/2023]
Abstract
The structural and magnetic properties of a drop-cast film of flat C54H34Br4CuO4, a β-diketonato complex functionalized with bromine atoms, on a graphite surface are investigated using scanning tunneling microscopy, synchrotron X-ray absorption spectroscopy, and X-ray magnetic circular dichroism. Experimental measurements reveal that the Cu-complexes preferentially lay flat on the graphite surface. The magnetic hysteresis loops show that the organic thin film remains paramagnetic at 2 K with an easy axis of magnetization perpendicular to the graphite surface and is therefore perpendicular to the plane of the Cu-complex skeleton.
Collapse
Affiliation(s)
- Emilio Vélez-Fort
- European Synchrotron Radiation Facility (ESRF), Avenue des Martyrs 71, 38043 Grenoble, France
| | - Philippe Ohresser
- Synchrotron SOLEIL, L'Orme des Merisiers, F-91190 Saint-Aubin, France
| | - Mathieu G Silly
- Synchrotron SOLEIL, L'Orme des Merisiers, F-91190 Saint-Aubin, France
| | - Jacques Bonvoisin
- CEMES, CNRS UPR 8011, Université de Toulouse, 29 Rue Jeanne Marvig, B.P. 94347, 31055 Toulouse Cedex 4, France
| | - Fabien Silly
- Université Paris-Saclay, CEA, CNRS, SPEC, TITANS, F-91191 Gif sur Yvette, France
| |
Collapse
|
6
|
Jungcharoen P, Marsac R, Choueikani F, Masson D, Pédrot M. Influence of organic ligands on the stoichiometry of magnetite nanoparticles. NANOSCALE ADVANCES 2023; 5:4213-4223. [PMID: 37560422 PMCID: PMC10408591 DOI: 10.1039/d3na00240c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Accepted: 07/10/2023] [Indexed: 08/11/2023]
Abstract
Magnetite, a ubiquitous mineral in natural systems, is of high interest for a variety of applications including environmental remediation, medicine, and catalysis. If the transformation of magnetite to maghemite through the oxidation of Fe2+ has been well documented, mechanisms involving dissolution processes of Fe2+ in aqueous solutions have been overlooked. Here, the effect of dissolved organic ligands (EDTA (ethylenediaminetetraacetic acid), acetic, lactic and citric acids) on Fe2+ solubility and on the stoichiometry (Fe(ii)/Fe(iii)) of magnetite-maghemite nanoparticles (∼10 nm) was investigated. These ligands were chosen because of their environmental relevance and because they are widely used as coating agents for nanotechnology applications. Results show an insignificant effect of 2 organic ligands (acetate and lactate) on the dissolution of Fe. By contrast, citrate and EDTA enhanced Fe solubility because of the formation of dissolved Fe(ii)- and Fe(iii)-ligand complexes. Both ligands selectively bound Fe(ii) over Fe(iii), but EDTA was much more selective than citrate. The combined effects of oxidation and H+- and ligand-promoted dissolution of Fe from magnetite were predicted using a magnetite-maghemite solid solution model, accounting for the formation of dissolved Fe(ii)- and Fe(iii)-ligand complexes. Therefore, these results show that citrate and EDTA (i) enhance Fe solubility in the presence of magnetite nanoparticles and (ii) modify magnetite stoichiometry, which affects its environmental behavior and its properties for nanotechnology applications.
Collapse
Affiliation(s)
- Phoomipat Jungcharoen
- Univ Rennes, CNRS, Géosciences Rennes - UMR 6118 F-35000 Rennes France
- Department of Environmental Engineering, Faculty of Engineering and Research Center for Environmental and Hazardous Substance Management, Khon Kaen University Khon Kaen 40002 Thailand
| | - Rémi Marsac
- Univ Rennes, CNRS, Géosciences Rennes - UMR 6118 F-35000 Rennes France
| | - Fadi Choueikani
- Synchrotron SOLEIL L'Orme des Merisiers Saint-Aubin BP48 91192 Gif-sur-Yvette Cedex France
| | - Delphine Masson
- Univ Rennes, CNRS, Géosciences Rennes - UMR 6118 F-35000 Rennes France
| | - Mathieu Pédrot
- Univ Rennes, CNRS, Géosciences Rennes - UMR 6118 F-35000 Rennes France
| |
Collapse
|
7
|
Li C, Robles R, Lorente N, Mahatha SK, Rohlf S, Rossnagel K, Barla A, Sorokin BV, Rusponi S, Ohresser P, Realista S, Martinho PN, Jasper-Toennies T, Weismann A, Berndt R, Gruber M. Large Orbital Moment of Two Coupled Spin-Half Co Ions in a Complex on Gold. ACS NANO 2023. [PMID: 37224165 DOI: 10.1021/acsnano.3c01595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The magnetic properties of transition-metal ions are generally described by the atomic spins of the ions and their exchange coupling. The orbital moment, usually largely quenched due the ligand field, is then seen as a perturbation. In such a scheme, S = 1/2 ions are predicted to be isotropic. We investigate a Co(II) complex with two antiferromagnetically coupled 1/2 spins on Au(111) using low-temperature scanning tunneling microscopy, X-ray magnetic circular dichroism, and density functional theory. We find that each of the Co ions has an orbital moment comparable to that of the spin, leading to magnetic anisotropy, with the spins preferentially oriented along the Co-Co axis. The orbital moment and the associated magnetic anisotropy is tuned by varying the electronic coupling of the molecule to the substrate and the microscope tip. These findings show the need to consider the orbital moment even in systems with strong ligand fields. As a consequence, the description of S = 1/2 ions becomes strongly modified, which have important consequences for these prototypical systems for quantum operations.
Collapse
Affiliation(s)
- Chao Li
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - Roberto Robles
- Centro de Física de Materiales CFM/MPC (CSIC-UPV/EHU), 20018 Donostia-San Sebastián, Spain
| | - Nicolas Lorente
- Centro de Física de Materiales CFM/MPC (CSIC-UPV/EHU), 20018 Donostia-San Sebastián, Spain
- Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastian, Spain
| | - Sanjoy Kr Mahatha
- Ruprecht Haensel Laboratory, Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
| | - Sebastian Rohlf
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - Kai Rossnagel
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
- Ruprecht Haensel Laboratory, Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
| | - Alessandro Barla
- Istituto di Struttura della Materia (ISM), Consiglio Nazionale delle Ricerche (CNR), 34149 Trieste, Italy
| | - Boris V Sorokin
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, 1015 Lausanne, Switzerland
| | - Stefano Rusponi
- Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, 1015 Lausanne, Switzerland
| | | | - Sara Realista
- Centro de Química Estrutural, Institute of Molecular Sciences, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - Paulo N Martinho
- Centro de Química Estrutural, Institute of Molecular Sciences, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - Torben Jasper-Toennies
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - Alexander Weismann
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - Richard Berndt
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - Manuel Gruber
- Faculty of Physics and CENIDE, University of Duisburg-Essen, 47057 Duisburg, Germany
| |
Collapse
|
8
|
Abstract
Major advances in X-ray sources including the development of circularly polarized and orbital angular momentum pulses make it possible to probe matter chirality at unprecedented energy regimes and with Ångström and femtosecond spatiotemporal resolutions. We survey the theory of stationary and time-resolved nonlinear chiral measurements that can be carried out in the X-ray regime using tabletop X-ray sources or large scale (XFEL, synchrotron) facilities. A variety of possible signals and their information content are discussed.
Collapse
Affiliation(s)
- Jérémy R Rouxel
- Université de Lyon, UJM-Saint-Etienne, CNRS, IOGS, Laboratoire Hubert Curien UMR 5516, Saint-Etienne F-42023, France
| | - Shaul Mukamel
- Department of Chemistry and Physics & Astronomy, University of California, Irvine, California 92697-2025, United States
| |
Collapse
|
9
|
Kleine C, Winghart MO, Zhang ZY, Richter M, Ekimova M, Eckert S, Vrakking MJJ, Nibbering ETJ, Rouzée A, Grant ER. Electronic State Population Dynamics upon Ultrafast Strong Field Ionization and Fragmentation of Molecular Nitrogen. PHYSICAL REVIEW LETTERS 2022; 129:123002. [PMID: 36179157 DOI: 10.1103/physrevlett.129.123002] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 07/20/2022] [Accepted: 08/10/2022] [Indexed: 06/16/2023]
Abstract
Air lasing from single ionized N_{2}^{+} molecules induced by laser filamentation in air has been intensively investigated and the mechanisms responsible for lasing are currently highly debated. We use ultrafast nitrogen K-edge spectroscopy to follow the strong field ionization and fragmentation dynamics of N_{2} upon interaction with an ultrashort 800 nm laser pulse. Using probe pulses generated by extreme high-order harmonic generation, we observe transitions indicative of the formation of the electronic ground X^{2}Σ_{g}^{+}, first excited A^{2}Π_{u}, and second excited B^{2}Σ_{u}^{+} states of N_{2}^{+} on femtosecond timescales, from which we can quantitatively determine the time-dependent electronic state population distribution dynamics of N_{2}^{+}. Our results show a remarkably low population of the A^{2}Π_{u} state, and nearly equal populations of the X^{2}Σ_{g}^{+} and B^{2}Σ_{u}^{+} states. In addition, we observe fragmentation of N_{2}^{+} into N and N^{+} on a timescale of several tens of picoseconds that we assign to significant collisional dynamics in the plasma, resulting in dissociative excitation of N_{2}^{+}.
Collapse
Affiliation(s)
- Carlo Kleine
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Straße 2a, 12489 Berlin, Germany
| | - Marc-Oliver Winghart
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Straße 2a, 12489 Berlin, Germany
| | - Zhuang-Yan Zhang
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Straße 2a, 12489 Berlin, Germany
| | - Maria Richter
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Straße 2a, 12489 Berlin, Germany
| | - Maria Ekimova
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Straße 2a, 12489 Berlin, Germany
| | - Sebastian Eckert
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Straße 2a, 12489 Berlin, Germany
| | - Marc J J Vrakking
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Straße 2a, 12489 Berlin, Germany
| | - Erik T J Nibbering
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Straße 2a, 12489 Berlin, Germany
| | - Arnaud Rouzée
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Straße 2a, 12489 Berlin, Germany
| | - Edward R Grant
- Department of Chemistry and Department of Physics and Astronomy, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
| |
Collapse
|
10
|
Magnetic molecules as local sensors of topological hysteresis of superconductors. Nat Commun 2022; 13:3838. [PMID: 35788608 PMCID: PMC9253336 DOI: 10.1038/s41467-022-31320-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 06/14/2022] [Indexed: 11/08/2022] Open
Abstract
Superconductors and magnetic materials, including molecules, are key ingredients for quantum computing and spintronics. However, only a little is known about how these materials interact in multilayer nanostructures like the hybrid architectures nowadays under development for such advanced applications. Here, we show that a single layer of magnetic molecules, Terbium(III) bis-phthalocyaninato (TbPc2) complexes, deposited under controlled UHV conditions on a superconducting Pb(111) surface is sensitive to the topology of the intermediate state of the superconductor, namely to the presence and evolution of superconducting and normal domains due to screening and penetration of an external magnetic field. The topological hysteresis of the superconducting substrate imprints a local evolution of the magnetisation of the TbPc2 molecules in the monolayer. Element and surface selective detection is achieved by recording the X-ray magnetic circular dichroism of the Tb atoms. This study reveals the impressive potential of magnetic molecules for sensing local magnetic field variations in molecular/superconductor hybrid devices, including spin resonators or spin injecting and spin filtering components for spintronics applications.
Collapse
|
11
|
Zhuang Y, Huang Q, Tan W, Qi R, Zhou H, Zhang Z, Wang Z. Cr/C multilayer growth on a heavy metal layer for upgrading of high efficiency tender x-ray gratings. APPLIED OPTICS 2022; 61:5769-5775. [PMID: 36255811 DOI: 10.1364/ao.461374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2022] [Accepted: 06/12/2022] [Indexed: 06/16/2023]
Abstract
To increase efficiency of single layer gratings used in the tender x-ray range, a high reflectance multilayer can be directly grown on single layer gratings. Multilayer growth quality was studied by depositing the Cr/C multilayer on a Pt single layer using flat substrates. Their structure quality and adhesion were characterized by atomic force microscopy (AFM), grazing incidence x-ray reflectivity (GIXRR), x-ray scattering (XRS), x-ray diffraction (XRD), and layer adhesion measurement. AFM results showed that the surface roughness was 0.218 nm for the multilayer without the Pt layer and 0.272 nm for the multilayer with the Pt layer. As GIXRR results showed, the average interface widths were 0.39 nm for the multilayer without the Pt layer and 0.42 nm for the multilayer with the Pt layer. XRS results indicated that the existence of a Pt layer enlarged slightly the roughness of the multilayer. Simulation results exhibited that these slight changes caused by the Pt layer had an insignificant effect on reflectivity. As XRD results displayed, the crystallization of the Pt layer had negligible effects on the crystallization of Cr in films. The layer adhesion measurement revealed that the critical loads to peel off the layer from the substrate were 84.64 mN for the multilayer without the Pt layer and 33.99 mN for the multilayer with the Pt layer. After 6 months, the latter layer structure is undamaged, demonstrating that the coating is not easily peeled off. This study proves the feasibility to upgrade a low efficiency single Pt layer grating to a highly efficient multilayer grating.
Collapse
|
12
|
Kuo CY, Liou YD, Hu Z, Liao SC, Tsai HM, Fu HW, Hua CY, Chen YC, Lin HJ, Tanaka A, Chen CT, Yang JC, Chang CF. Photonic-Crafting of Non-Volatile and Rewritable Antiferromagnetic Spin Textures with Drastic Difference in Electrical Conductivity. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2200610. [PMID: 35312103 DOI: 10.1002/adma.202200610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 03/15/2022] [Indexed: 06/14/2023]
Abstract
Antiferromagnetic spintronics is an emerging field of non-volatile data storage and information processing. The zero net magnetization and zero stray fields of antiferromagnetic materials eliminate interference between neighbor units, leading to high-density memory integrations. However, this invisible magnetic character at the same time also poses a great challenge in controlling and detecting magnetic states in antiferromagnets. Here, two antiferromagnetic spin states close in energy in strained BiFeO3 thin films at room temperature are discovered. It can be reversibly switched between these two non-volatile antiferromagnetic states by a moderate magnetic field and a non-contact optical approach. Importantly, the conductivity of the areas with each antiferromagnetic textures is drastically different. It is conclusively demonstrated the capability of optical writing and electrical reading of these newly discovered bistable antiferromagnetic states in the BiFeO3 thin films.
Collapse
Affiliation(s)
- Chang-Yang Kuo
- Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu, 30010, Taiwan
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu, 30076, Taiwan
| | - Yi-De Liou
- Department of Physics, National Cheng Kung University, Tainan, 70101, Taiwan
- Center for Quantum Frontiers of Research & Technology (QFort), National Cheng Kung University, Tainan, 70101, Taiwan
| | - Zhiwei Hu
- Max-Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, Dresden, 01187, Germany
| | - Sheng-Chieh Liao
- Max-Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, Dresden, 01187, Germany
| | - Huang-Ming Tsai
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu, 30076, Taiwan
| | - Huang-Wen Fu
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu, 30076, Taiwan
| | - Chih-Yu Hua
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu, 30076, Taiwan
| | - Yi-Chun Chen
- Department of Physics, National Cheng Kung University, Tainan, 70101, Taiwan
- Center for Quantum Frontiers of Research & Technology (QFort), National Cheng Kung University, Tainan, 70101, Taiwan
| | - Hong-Ji Lin
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu, 30076, Taiwan
| | - Arata Tanaka
- Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima, 739-8530, Japan
| | - Chien-Te Chen
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu, 30076, Taiwan
| | - Jan-Chi Yang
- Department of Physics, National Cheng Kung University, Tainan, 70101, Taiwan
- Center for Quantum Frontiers of Research & Technology (QFort), National Cheng Kung University, Tainan, 70101, Taiwan
| | - Chun-Fu Chang
- Max-Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40, Dresden, 01187, Germany
| |
Collapse
|
13
|
Joly L, Scheurer F, Ohresser P, Kengni-Zanguim B, Dayen JF, Seneor P, Dlubak B, Godel F, Halley D. X-ray magnetic dichroism and tunnel magneto-resistance study of the magnetic phase in epitaxial CrVO xnanoclusters. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:175801. [PMID: 35084366 DOI: 10.1088/1361-648x/ac4f5e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 01/25/2022] [Indexed: 06/14/2023]
Abstract
Epitaxial clusters of chromium and chromium-vanadium oxides are studied by tunnel magneto-resistivity measurements, x-ray absorption spectrometry and circular magnetic circular dichroism. They turn out to carry a small magnetic moment that follows a super-paramagnetic behavior. The chromium ion contribution to this magnetization is mainly due to an original magnetic Cr2O3-like phase, whereas usual Cr2O3is known to be anti-ferromagnetic in the bulk. For mixed clusters, vanadium ions also contribute to the total magnetization and they are coupled to the chromium ion spins. By measuring the dichroic signal at different temperatures, we get insight into the possible spin configurations of vanadium and chromium ions: we propose that the magnetic dipoles observed in the clusters assembly could be related to ionic spins that couple at a very short range, as for instance in short one-dimensional spins chains.
Collapse
Affiliation(s)
- Loïc Joly
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS, UMR 7504, F-67000 Strasbourg, France
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette, France
| | - Fabrice Scheurer
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS, UMR 7504, F-67000 Strasbourg, France
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette, France
| | - Philippe Ohresser
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, F-91192 Gif-sur-Yvette, France
| | - Brice Kengni-Zanguim
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS, UMR 7504, F-67000 Strasbourg, France
| | - Jean-François Dayen
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS, UMR 7504, F-67000 Strasbourg, France
| | - Pierre Seneor
- Unité Mixte de Physique CNRS Thales, Université Paris-Saclay Palaiseau, France
| | - Bruno Dlubak
- Unité Mixte de Physique CNRS Thales, Université Paris-Saclay Palaiseau, France
| | - Florian Godel
- Unité Mixte de Physique CNRS Thales, Université Paris-Saclay Palaiseau, France
| | - David Halley
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS, UMR 7504, F-67000 Strasbourg, France
| |
Collapse
|
14
|
Investigation of a Tetrathiafulvalene-Based Fe2+ Thermal Spin Crossover Assembled on Gold Surface. MAGNETOCHEMISTRY 2022. [DOI: 10.3390/magnetochemistry8020014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A thick film and a monolayer of tetrathiafulvalene-based Fe2+ spin-crossover complex have been deposited by solution on a Au (111) substrate, attempting both self-assembling monolayer protocol and a simpler drop-casting procedure. The thermally induced spin transition has been investigated using X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS). Temperature-dependent investigations demonstrated the retention of the switching behavior between the two spin states in thick molecular films obtained by drop-casting, while in the monolayer sample, the loss of the spin-crossover properties appears as a possible consequence of the strong interaction between the sulfur atoms of the ligand and the gold substrate.
Collapse
|
15
|
Hof F, Poggini L, Otero E, Gobaut B, Gonidec M, Duttine M, Rosa P, Sandre O, Pénicaud A. Magnetic Ordering in Ultrasmall Potassium Ferrite Nanoparticles Grown on Graphene Nanoflakes. ACS APPLIED MATERIALS & INTERFACES 2022; 14:3130-3142. [PMID: 34981916 DOI: 10.1021/acsami.1c19353] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Magnetic nanoparticles are central to the development of efficient hyperthermia treatments, magnetic drug carriers, and multimodal contrast agents. While the magnetic properties of small crystalline iron oxide nanoparticles are well understood, the superparamagnetic size limit constitutes a significant barrier for further size reduction. Iron (oxy)hydroxide phases, albeit very common in the natural world, are far less studied, generally due to their poor crystallinity. Templating ultrasmall nanoparticles on substrates such as graphene is a promising method to prevent aggregation, typically an issue for both material characterization and applications. We generate ultrasmall nanoparticles, directly on the carbon framework by the reaction of a graphenide potassium solution, charged graphene flakes, with iron(II) salts. After mild water oxidation, the obtained composite material consists of ultrasmall potassium ferrite nanoparticles bound to the graphene nanoflakes. Magnetic properties as evidenced by magnetometry and X-ray magnetic circular dichroism, with open magnetic hysteresis loops near room temperature, are widely different from classical ultrasmall superparamagnetic iron oxide nanoparticles. The large value obtained for the effective magnetic anisotropy energy density Keff accounts for the presence of magnetic ordering at rather high temperatures. The synthesis of ultrasmall potassium ferrite nanoparticles under such mild conditions is remarkable given the harsh conditions used for the classical syntheses of bulk potassium ferrites. Moreover, the potassium incorporation in the crystal lattice occurs in the presence of potassium cations under mild conditions. A transfer of this method to related reactions would be of great interest, which underlines the synthetic value of this study. These findings also give another view on the previously reported electrocatalytic properties of these nanocomposite materials, especially for the sought-after oxygen reduction/evolution reaction. Finally, their longitudinal and transverse proton NMR relaxivities when dispersed in water were assessed at 37 °C under a magnetic field of 1.41 T, allowing potential applications in biological imaging.
Collapse
Affiliation(s)
- Ferdinand Hof
- University of Bordeaux, CNRS, Centre de Recherche Paul Pascal, UMR5031, 33600 Pessac, France
| | - Lorenzo Poggini
- University of Bordeaux, CNRS, Bordeaux-INP, ICMCB, UMR 5026, F-33600 Pessac, Cedex, France
| | - Edwige Otero
- Synchrotron SOLEIL, L'Orme des Merisiers Saint Aubin, BP 48, F-91192 Gif sur Yvette, France
| | - Benoît Gobaut
- Synchrotron SOLEIL, L'Orme des Merisiers Saint Aubin, BP 48, F-91192 Gif sur Yvette, France
| | - Mathieu Gonidec
- University of Bordeaux, CNRS, Bordeaux-INP, ICMCB, UMR 5026, F-33600 Pessac, Cedex, France
| | - Mathieu Duttine
- University of Bordeaux, CNRS, Bordeaux-INP, ICMCB, UMR 5026, F-33600 Pessac, Cedex, France
| | - Patrick Rosa
- University of Bordeaux, CNRS, Bordeaux-INP, ICMCB, UMR 5026, F-33600 Pessac, Cedex, France
| | - Olivier Sandre
- University of Bordeaux, CNRS, Bordeaux INP, LCPO, UMR-5629, F-33600 Pessac, France
| | - Alain Pénicaud
- University of Bordeaux, CNRS, Centre de Recherche Paul Pascal, UMR5031, 33600 Pessac, France
| |
Collapse
|
16
|
Zhang L, Arrio MA, Mazerat S, Catala L, Li W, Otero E, Ohresser P, Lisnard L, Cartier Dit Moulin C, Mallah T, Sainctavit P. Magnetic Hysteresis in a Monolayer of Oriented 6 nm CsNiCr Prussian Blue Analogue Nanocrystals. Inorg Chem 2021; 60:16388-16396. [PMID: 34624189 DOI: 10.1021/acs.inorgchem.1c02237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Prussian blue analogue nanocrystals of the CsINiII[CrIII(CN)6] cubic network with 6 nm size were assembled as a single monolayer on highly organized pyrolytic graphite (HOPG). X-ray magnetic circular dichroism (XMCD) studies, at the Ni and Cr L2,3 edges, reveal the presence of an easy plane of magnetization evidenced by an opening of the magnetic hysteresis loop (coercive field of ≈200 Oe) when the magnetic field, B, is at 60° relative to the normal to the substrate. The angular dependence of the X-ray natural linear dichroism (XNLD) reveals both an orientation of the nanocrystals on the substrate and an anisotropy of the electronic cloud of the NiII and CrIII coordination sphere species belonging to the nanocrystals' surface. Ligand field multiplet (LFM) calculations that reproduce the experimental data are consistent with an elongated tetragonal distortion of surface NiII coordination sphere responsible for the magnetic behavior of monolayer.
Collapse
Affiliation(s)
- Luqiong Zhang
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, 91405 Orsay Cedex, France.,Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, MNHN, UMR 7590, Sorbonne Université, CNRS, 75252 Paris Cedex 05, France
| | - Marie-Anne Arrio
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, MNHN, UMR 7590, Sorbonne Université, CNRS, 75252 Paris Cedex 05, France
| | - Sandra Mazerat
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, 91405 Orsay Cedex, France
| | - Laure Catala
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, 91405 Orsay Cedex, France
| | - Weibin Li
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, MNHN, UMR 7590, Sorbonne Université, CNRS, 75252 Paris Cedex 05, France.,L'Orme des Merisiers, Synchrotron SOLEIL, 91192 Saint-Aubin, France
| | - Edwige Otero
- L'Orme des Merisiers, Synchrotron SOLEIL, 91192 Saint-Aubin, France
| | | | - Laurent Lisnard
- Institut Parisien de Chimie Moléculaire, IPCM, Sorbonne Université, CNRS, F-75005 Paris, France
| | | | - Talal Mallah
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, 91405 Orsay Cedex, France
| | - Philippe Sainctavit
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, Université Paris-Saclay, CNRS, 91405 Orsay Cedex, France.,Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, MNHN, UMR 7590, Sorbonne Université, CNRS, 75252 Paris Cedex 05, France.,L'Orme des Merisiers, Synchrotron SOLEIL, 91192 Saint-Aubin, France
| |
Collapse
|
17
|
Kleine C, Ekimova M, Winghart MO, Eckert S, Reichel O, Löchel H, Probst J, Braig C, Seifert C, Erko A, Sokolov A, Vrakking MJJ, Nibbering ETJ, Rouzée A. Highly efficient soft x-ray spectrometer for transient absorption spectroscopy with broadband table-top high harmonic sources. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2021; 8:034302. [PMID: 34235230 PMCID: PMC8249000 DOI: 10.1063/4.0000096] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Accepted: 05/04/2021] [Indexed: 06/13/2023]
Abstract
We present a novel soft x-ray spectrometer for ultrafast absorption spectroscopy utilizing table-top femtosecond high-order harmonic sources. Where most commercially available spectrometers rely on spherical variable line space gratings with a typical efficiency on the order of 3% in the first diffractive order, this spectrometer, based on a Hettrick-Underwood design, includes a reflective zone plate as a dispersive element. An improved efficiency of 12% at the N K-edge is achieved, accompanied by a resolving power of 890. The high performance of the soft x-ray spectrometer is further demonstrated by comparing nitrogen K-edge absorption spectra from calcium nitrate in aqueous solution obtained with our high-order harmonic source to previous measurements performed at the electron storage ring facility BESSY II.
Collapse
Affiliation(s)
- Carlo Kleine
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max Born Str. 2a, 12489 Berlin, Germany
| | - Maria Ekimova
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max Born Str. 2a, 12489 Berlin, Germany
| | - Marc-Oliver Winghart
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max Born Str. 2a, 12489 Berlin, Germany
| | - Sebastian Eckert
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max Born Str. 2a, 12489 Berlin, Germany
| | - Oliver Reichel
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max Born Str. 2a, 12489 Berlin, Germany
| | - Heike Löchel
- Nano Optics Berlin GmbH, Krumme Strasse 64, 10627 Berlin, Germany
| | - Jürgen Probst
- Nano Optics Berlin GmbH, Krumme Strasse 64, 10627 Berlin, Germany
| | - Christoph Braig
- Institute of Applied Photonics (IAP) e.V., Rudower Chaussee 29/31, 12489 Berlin, Germany
| | - Christian Seifert
- Institute of Applied Photonics (IAP) e.V., Rudower Chaussee 29/31, 12489 Berlin, Germany
| | - Alexei Erko
- Institute of Applied Photonics (IAP) e.V., Rudower Chaussee 29/31, 12489 Berlin, Germany
| | - Andrey Sokolov
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Albert-Einstein Strasse 15, 12489 Berlin, Germany
| | - Marc J. J. Vrakking
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max Born Str. 2a, 12489 Berlin, Germany
| | - Erik T. J. Nibbering
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max Born Str. 2a, 12489 Berlin, Germany
| | - Arnaud Rouzée
- Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max Born Str. 2a, 12489 Berlin, Germany
| |
Collapse
|
18
|
Feng Y, Huang Q, Zhuang Y, Sokolov A, Lemke S, Qi R, Zhang Z, Wang Z. Mo/Si lamellar multilayer gratings with high efficiency and enhanced resolution for the x-ray region of 1000-1700eV. OPTICS EXPRESS 2021; 29:13416-13427. [PMID: 33985075 DOI: 10.1364/oe.422483] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Accepted: 03/24/2021] [Indexed: 06/12/2023]
Abstract
The d-spacing of the multilayer lamellar grating was theoretically optimized to improve the energy resolution and maintain a high efficiency. Based on the study of the growth behavior of Mo/Si multilayer on the lamellar grating under different sputtering pressures, Ar gas pressure of 1 mTorr was selected, which can fabricate the multilayer with lower roughness and a good replication of the groove shape. An absolute diffraction efficiency of 25.6% and a Cff factor of 1.79 were achieved for the -1st order of the Mo/Si lamellar multilayer grating at an energy of 1700 eV.
Collapse
|
19
|
Sartori K, Musat A, Choueikani F, Grenèche JM, Hettler S, Bencok P, Begin-Colin S, Steadman P, Arenal R, Pichon BP. A Detailed Investigation of the Onion Structure of Exchanged Coupled Magnetic Fe 3-δO 4@CoFe 2O 4@Fe 3-δO 4 Nanoparticles. ACS APPLIED MATERIALS & INTERFACES 2021; 13:16784-16800. [PMID: 33780236 DOI: 10.1021/acsami.0c18310] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Nanoparticles that combine several magnetic phases offer wide perspectives for cutting edge applications because of the high modularity of their magnetic properties. Besides the addition of the magnetic characteristics intrinsic to each phase, the interface that results from core-shell and, further, from onion structures leads to synergistic properties such as magnetic exchange coupling. Such a phenomenon is of high interest to overcome the superparamagnetic limit of iron oxide nanoparticles which hampers potential applications such as data storage or sensors. In this manuscript, we report on the design of nanoparticles with an onion-like structure which has been scarcely reported yet. These nanoparticles consist of a Fe3-δO4 core covered by a first shell of CoFe2O4 and a second shell of Fe3-δO4, e.g., a Fe3-δO4@CoFe2O4@Fe3-δO4 onion-like structure. They were synthesized through a multistep seed-mediated growth approach which consists consists in performing three successive thermal decomposition of metal complexes in a high-boiling-point solvent (about 300 °C). Although TEM micrographs clearly show the growth of each shell from the iron oxide core, core sizes and shell thicknesses markedly differ from what is suggested by the size increasing. We investigated very precisely the structure of nanoparticles in performing high resolution (scanning) TEM imaging and geometrical phase analysis (GPA). The chemical composition and spatial distribution of atoms were studied by electron energy loss spectroscopy (EELS) mapping and spectroscopy. The chemical environment and oxidation state of cations were investigated by 57Fe Mössbauer spectrometry, soft X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD). The combination of these techniques allowed us to estimate the increase of Fe2+ content in the iron oxide core of the core@shell structure and the increase of the cobalt ferrite shell thickness in the core@shell@shell one, whereas the iron oxide shell appears to be much thinner than expected. Thus, the modification of the chemical composition as well as the size of the Fe3-δO4 core and the thickness of the cobalt ferrite shell have a high impact on the magnetic properties. Furthermore, the growth of the iron oxide shell also markedly modifies the magnetic properties of the core-shell nanoparticles, thus demonstrating the high potential of onion-like nanoparticles to accurately tune the magnetic properties of nanoparticles according to the desired applications.
Collapse
Affiliation(s)
- Kevin Sartori
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, Strasbourg F-67000, France
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin BP48, Gif-sur-Yvette 91192, France
- Laboratoire Léon Brillouin, UMR12 CEA-CNRS, Gif-sur-Yvette F-91191, France
| | - Anamaria Musat
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, Strasbourg F-67000, France
| | - Fadi Choueikani
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin BP48, Gif-sur-Yvette 91192, France
| | - Jean-Marc Grenèche
- Institut des Molécules et Matériaux du Mans, IMMM, UMR CNRS-6283 Université du Maine, avenue Olivier Messiaen, Le Mans Cedex 9 72085, France
| | - Simon Hettler
- Instituto de Nanociencia y Materiales de Aragon (INMA), CSIC-Universidad de Zaragoza, Calle Pedro Cerbuna, Zaragoza 50009, Spain
- Laboratorio de Microscopias Avanzadas (LMA), Universidad de Zaragoza, Calle Mariano Esquillor, Zaragoza 50018, Spain
| | - Peter Bencok
- Diamond Light Source, Didcot OX11 0DE, United Kingdom
| | - Sylvie Begin-Colin
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, Strasbourg F-67000, France
| | - Paul Steadman
- Diamond Light Source, Didcot OX11 0DE, United Kingdom
| | - Raul Arenal
- Instituto de Nanociencia y Materiales de Aragon (INMA), CSIC-Universidad de Zaragoza, Calle Pedro Cerbuna, Zaragoza 50009, Spain
- Laboratorio de Microscopias Avanzadas (LMA), Universidad de Zaragoza, Calle Mariano Esquillor, Zaragoza 50018, Spain
- Fundacion ARAID, 50018 Zaragoza, Spain
| | - Benoit P Pichon
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, Strasbourg F-67000, France
- Institut Universitaire de France, 1 rue Descartes, 75231 Paris Cedex 05, France
| |
Collapse
|
20
|
Chen C, Spree L, Koutsouflakis E, Krylov DS, Liu F, Brandenburg A, Velkos G, Schimmel S, Avdoshenko SM, Fedorov A, Weschke E, Choueikani F, Ohresser P, Dreiser J, Büchner B, Popov AA. Magnetic Hysteresis at 10 K in Single Molecule Magnet Self-Assembled on Gold. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:2000777. [PMID: 33717832 PMCID: PMC7927621 DOI: 10.1002/advs.202000777] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 11/26/2020] [Indexed: 06/12/2023]
Abstract
Tremendous progress in the development of single molecule magnets (SMMs) raises the question of their device integration. On this route, understanding the properties of low-dimensional assemblies of SMMs, in particular in contact with electrodes, is a necessary but difficult step. Here, it is shown that fullerene SMM self-assembled on metal substrate from solution retains magnetic hysteresis up to 10 K. Fullerene-SMM DySc2N@C80 and Dy2ScN@C80 are derivatized to introduce a thioacetate group, which is used to graft SMMs on gold. Magnetic properties of grafted SMMs are studied by X-ray magnetic circular dichroism and compared to the films of nonderivatized fullerenes prepared by sublimation. In self-assembled films, the magnetic moments of the Dy ions are preferentially aligned parallel to the surface, which is different from the disordered orientation of endohedral clusters in nonfunctionalized fullerenes. Whereas chemical derivatization reduces the blocking temperature of magnetization and narrows the hysteresis of Dy2ScN@C80, for DySc2N@C80 equally broad hysteresis is observed as in the fullerene multilayer. Magnetic bistability in the DySc2N@C80 grafted on gold is sustained up to 10 K. This study demonstrates that self-assembly of fullerene-SMM derivatives offers a facile solution-based procedure for the preparation of functional magnetic sub-monolayers with excellent SMM performance.
Collapse
Affiliation(s)
- Chia‐Hsiang Chen
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
- Department of Medicinal and Applied ChemistryKaohsiung Medical UniversityKaohsiung807Taiwan
| | - Lukas Spree
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
| | - Emmanouil Koutsouflakis
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
| | - Denis S. Krylov
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
- Center for Quantum NanoscienceInstitute for Basic Science (IBS)Seoul03760Republic of Korea
| | - Fupin Liu
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
| | - Ariane Brandenburg
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
| | - Georgios Velkos
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
| | - Sebastian Schimmel
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
| | - Stanislav M. Avdoshenko
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
| | - Alexander Fedorov
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
- Helmholtz‐Zentrum Berlin für Materialien und EnergieWilhelm‐Conrad‐Röntgen‐Campus BESSY IIAlbert‐Einstein‐Strasse 15BerlinD‐12489Germany
| | - Eugen Weschke
- Helmholtz‐Zentrum Berlin für Materialien und EnergieWilhelm‐Conrad‐Röntgen‐Campus BESSY IIAlbert‐Einstein‐Strasse 15BerlinD‐12489Germany
| | - Fadi Choueikani
- Synchrotron SOLEILL'Orme des MerisiersSaint‐Aubin, BP 48Gif‐sur‐Yvette91192France
| | - Philippe Ohresser
- Synchrotron SOLEILL'Orme des MerisiersSaint‐Aubin, BP 48Gif‐sur‐Yvette91192France
| | - Jan Dreiser
- Swiss Light SourcePaul Scherrer InstituteVilligen PSICH‐5232Switzerland
| | - Bernd Büchner
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
| | - Alexey A. Popov
- Leibniz Institute for Solid State and Materials ResearchHelmholtzstraße 20Dresden01069Germany
| |
Collapse
|
21
|
Wakabayashi D, Tanaka H, Toyoshima A, Yamashita S, Takeichi Y. Photoelectron shield for the first mirror of a soft X-ray beamline. JOURNAL OF SYNCHROTRON RADIATION 2021; 28:86-90. [PMID: 33399556 DOI: 10.1107/s1600577520013648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Accepted: 10/12/2020] [Indexed: 06/12/2023]
Abstract
At a soft X-ray beamline with an undulator source, significant heat generation at the first-mirror chamber and light emission at the viewport were found, which can be explained by photoelectrons from the mirror. The chamber temperature increases up to approximately 50°C over a period of several hours. A photoelectron shield consisting of thin copper plates not only prevents the heat generation and light emission but also improves the pressure of the vacuum chamber, if a voltage of a few tens of V is applied to the shield. The total electron yield of the shield reached as much as 58 mA under high heat-load conditions, indicating the emission of numerous photoelectrons from the first mirror. Heat-balance analyses suggest that approximately 30% or more of the heat load on the first mirror is transferred to the surroundings.
Collapse
Affiliation(s)
- Daisuke Wakabayashi
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - Hirokazu Tanaka
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - Akio Toyoshima
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - Shohei Yamashita
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| | - Yasuo Takeichi
- Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
| |
Collapse
|
22
|
Serri M, Cucinotta G, Poggini L, Serrano G, Sainctavit P, Strychalska-Nowak J, Politano A, Bonaccorso F, Caneschi A, Cava RJ, Sessoli R, Ottaviano L, Klimczuk T, Pellegrini V, Mannini M. Enhancement of the Magnetic Coupling in Exfoliated CrCl 3 Crystals Observed by Low-Temperature Magnetic Force Microscopy and X-ray Magnetic Circular Dichroism. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2000566. [PMID: 32390212 DOI: 10.1002/adma.202000566] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 03/21/2020] [Accepted: 04/14/2020] [Indexed: 06/11/2023]
Abstract
Magnetic crystals formed by 2D layers interacting by weak van der Waals forces are currently a hot research topic. When these crystals are thinned to nanometric size, they can manifest strikingly different magnetic behavior compared to the bulk form. This can be the result of, for example, quantum electronic confinement effects, the presence of defects, or pinning of the crystallographic structure in metastable phases induced by the exfoliation process. In this work, an investigation of the magnetism of micromechanically cleaved CrCl3 flakes with thickness >10 nm is performed. These flakes are characterized by superconducting quantum interference device magnetometry, surface-sensitive X-ray magnetic circular dichroism, and spatially resolved magnetic force microscopy. The results highlight an enhancement of the CrCl3 antiferromagnetic interlayer interaction that appears to be independent of the flake size when the thickness is tens of nanometers. The estimated exchange field is 9 kOe, representing an increase of ≈900% compared to the one of the bulk crystals. This effect can be attributed to the pinning of the high-temperature monoclinic structure, as recently suggested by polarized Raman spectroscopy investigations in thin (8-35 nm) CrCl3 flakes.
Collapse
Affiliation(s)
- Michele Serri
- Istituto Italiano di Tecnologia-Graphene Labs, via Morego 30, Genova, 16163, Italy
| | - Giuseppe Cucinotta
- Chemistry Department "U. Schiff" and INSTM RU, Università degli studi di Firenze, Via della Lastruccia 3-13, Sesto Fiorentino, 50019, Italy
| | - Lorenzo Poggini
- Chemistry Department "U. Schiff" and INSTM RU, Università degli studi di Firenze, Via della Lastruccia 3-13, Sesto Fiorentino, 50019, Italy
| | - Giulia Serrano
- Chemistry Department "U. Schiff" and INSTM RU, Università degli studi di Firenze, Via della Lastruccia 3-13, Sesto Fiorentino, 50019, Italy
- Department of Industrial Engineering DIEF, and INSTM RU, Università degli Studi di Firenze, Via di S. Marta 3, Firenze, 50139, Italy
| | - Philippe Sainctavit
- Institut de Mineralogie, de Physique des Materiaux et de Cosmochimie UMR 7590, CNRS, Sorbonne Université, MNHN, Paris, F-75005, France
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin-BP 48, Gif-sur-Yvette, F-91192, France
| | - Judyta Strychalska-Nowak
- Faculty of Applied Physics and Mathematics, Advanced Materials Center Gdansk University of Technology, Gdansk, 80-233, Poland
| | - Antonio Politano
- Dipartimento di Scienze Fisiche e Chimiche (DSFC), Università dell'Aquila, Via Vetoio 10, L'Aquila, 67100, Italy
- CNR-IMM Istituto per la Microelettronica e Microsistemi, VIII strada 5, Catania, I-95121, Italy
| | - Francesco Bonaccorso
- Istituto Italiano di Tecnologia-Graphene Labs, via Morego 30, Genova, 16163, Italy
- BeDimensional Spa, Genoa, 16163, Italy
| | - Andrea Caneschi
- Department of Industrial Engineering DIEF, and INSTM RU, Università degli Studi di Firenze, Via di S. Marta 3, Firenze, 50139, Italy
| | - Robert J Cava
- Department of Chemistry, Princeton University, Princeton, NJ, 08544, USA
| | - Roberta Sessoli
- Chemistry Department "U. Schiff" and INSTM RU, Università degli studi di Firenze, Via della Lastruccia 3-13, Sesto Fiorentino, 50019, Italy
| | - Luca Ottaviano
- Dipartimento di Scienze Fisiche e Chimiche (DSFC), Università dell'Aquila, Via Vetoio 10, L'Aquila, 67100, Italy
- CNR-SPIN UoS L'Aquila, Via Vetoio 46, L'Aquila, 67100, Italy
| | - Tomasz Klimczuk
- Faculty of Applied Physics and Mathematics, Advanced Materials Center Gdansk University of Technology, Gdansk, 80-233, Poland
| | - Vittorio Pellegrini
- Istituto Italiano di Tecnologia-Graphene Labs, via Morego 30, Genova, 16163, Italy
- BeDimensional Spa, Genoa, 16163, Italy
| | - Matteo Mannini
- Chemistry Department "U. Schiff" and INSTM RU, Università degli studi di Firenze, Via della Lastruccia 3-13, Sesto Fiorentino, 50019, Italy
| |
Collapse
|
23
|
Köbke A, Gutzeit F, Röhricht F, Schlimm A, Grunwald J, Tuczek F, Studniarek M, Longo D, Choueikani F, Otero E, Ohresser P, Rohlf S, Johannsen S, Diekmann F, Rossnagel K, Weismann A, Jasper-Toennies T, Näther C, Herges R, Berndt R, Gruber M. Reversible coordination-induced spin-state switching in complexes on metal surfaces. NATURE NANOTECHNOLOGY 2020; 15:18-21. [PMID: 31873288 DOI: 10.1038/s41565-019-0594-8] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Accepted: 11/14/2019] [Indexed: 06/10/2023]
Abstract
Molecular spin switches are attractive candidates for controlling the spin polarization developing at the interface between molecules and magnetic metal surfaces1,2, which is relevant for molecular spintronics devices3-5. However, so far, intrinsic spin switches such as spin-crossover complexes have suffered from fragmentation or loss of functionality following adsorption on metal surfaces, with rare exceptions6-9. Robust metal-organic platforms, on the other hand, rely on external axial ligands to induce spin switching10-14. Here we integrate a spin switching functionality into robust complexes, relying on the mechanical movement of an axial ligand strapped to the porphyrin ring. Reversible interlocked switching of spin and coordination, induced by electron injection, is demonstrated on Ag(111) for this class of compounds. The stability of the two spin and coordination states of the molecules exceeds days at 4 K. The potential applications of this switching concept go beyond the spin functionality, and may turn out to be useful for controlling the catalytic activity of surfaces15.
Collapse
Affiliation(s)
- Alexander Köbke
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| | - Florian Gutzeit
- Otto-Diels-Institut für Organische Chemie, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| | - Fynn Röhricht
- Otto-Diels-Institut für Organische Chemie, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| | - Alexander Schlimm
- Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| | - Jan Grunwald
- Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| | - Felix Tuczek
- Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| | | | - Danilo Longo
- Synchrotron SOLEIL, L'Orme des Merisiers, Gif-sur-Yvette, France
| | - Fadi Choueikani
- Synchrotron SOLEIL, L'Orme des Merisiers, Gif-sur-Yvette, France
| | - Edwige Otero
- Synchrotron SOLEIL, L'Orme des Merisiers, Gif-sur-Yvette, France
| | | | - Sebastian Rohlf
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
- Ruprecht-Haensel-Labor, Christian-Albrechts-Universität zu Kiel und Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - Sven Johannsen
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| | - Florian Diekmann
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
- Ruprecht-Haensel-Labor, Christian-Albrechts-Universität zu Kiel und Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - Kai Rossnagel
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
- Ruprecht-Haensel-Labor, Christian-Albrechts-Universität zu Kiel und Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
- Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
| | - Alexander Weismann
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| | - Torben Jasper-Toennies
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| | - Christian Näther
- Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| | - Rainer Herges
- Otto-Diels-Institut für Organische Chemie, Christian-Albrechts-Universität zu Kiel, Kiel, Germany.
| | - Richard Berndt
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Kiel, Germany
| | - Manuel Gruber
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Kiel, Germany.
| |
Collapse
|
24
|
Poggini L, Londi G, Milek M, Naim A, Lanzilotto V, Cortigiani B, Bondino F, Magnano E, Otero E, Sainctavit P, Arrio MA, Juhin A, Marchivie M, Khusniyarov MM, Totti F, Rosa P, Mannini M. Surface effects on a photochromic spin-crossover iron(ii) molecular switch adsorbed on highly oriented pyrolytic graphite. NANOSCALE 2019; 11:20006-20014. [PMID: 31603165 DOI: 10.1039/c9nr05947d] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Thin films of an iron(ii) complex with a photochromic diarylethene-based ligand and featuring a spin-crossover behaviour have been grown by sublimation in ultra-high vacuum on highly oriented pyrolytic graphite and spectroscopically characterized through high-resolution X-ray and ultraviolet photoemission, as well as via X-ray absorption. Temperature-dependent studies demonstrated that the thermally induced spin-crossover is preserved at a sub-monolayer (0.7 ML) coverage. Although the photochromic ligand ad hoc integrated into the complex allows the photo-switching of the spin state of the complex at room temperature both in bulk and for a thick film on highly oriented pyrolytic graphite, this photomagnetic effect is not observed in sub-monolayer deposits. Ab initio calculations justify this behaviour as the result of specific adsorbate-substrate interactions leading to the stabilization of the photoinactive form of the diarylethene ligand over photoactive one on the surface.
Collapse
Affiliation(s)
- Lorenzo Poggini
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit of Firenze, University of Firenze, I-50019 Sesto Fiorentino, Italy.
| | - Giacomo Londi
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit of Firenze, University of Firenze, I-50019 Sesto Fiorentino, Italy.
| | - Magdalena Milek
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstr. 1, 91058, Erlangen, Germany
| | - Ahmad Naim
- CNRS, Univ. Bordeaux, ICMCB, UMR5026, F-33600 Pessac, France
| | - Valeria Lanzilotto
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit of Firenze, University of Firenze, I-50019 Sesto Fiorentino, Italy.
| | - Brunetto Cortigiani
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit of Firenze, University of Firenze, I-50019 Sesto Fiorentino, Italy.
| | - Federica Bondino
- CNR-IOM, Laboratorio TASC, Basovizza SS-14, Km 163.5, 34149 Trieste, Italy
| | - Elena Magnano
- CNR-IOM, Laboratorio TASC, Basovizza SS-14, Km 163.5, 34149 Trieste, Italy
| | - Edwige Otero
- Synchrotron SOLEIL L'Orme des Merisiers Saint Aubin, BP 48 91192, Gif sur Yvette, France
| | - Philippe Sainctavit
- Synchrotron SOLEIL L'Orme des Merisiers Saint Aubin, BP 48 91192, Gif sur Yvette, France and IMPMC-UMR7590, CNRS, Sorbonne université, MNHN 4 place Jussieu, 75005 Paris, France
| | - Marie-Anne Arrio
- IMPMC-UMR7590, CNRS, Sorbonne université, MNHN 4 place Jussieu, 75005 Paris, France
| | - Amélie Juhin
- IMPMC-UMR7590, CNRS, Sorbonne université, MNHN 4 place Jussieu, 75005 Paris, France
| | | | - Marat M Khusniyarov
- Department of Chemistry and Pharmacy, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstr. 1, 91058, Erlangen, Germany
| | - Federico Totti
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit of Firenze, University of Firenze, I-50019 Sesto Fiorentino, Italy.
| | - Patrick Rosa
- CNRS, Univ. Bordeaux, ICMCB, UMR5026, F-33600 Pessac, France
| | - Matteo Mannini
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit of Firenze, University of Firenze, I-50019 Sesto Fiorentino, Italy.
| |
Collapse
|
25
|
Sartori K, Cotin G, Bouillet C, Halté V, Bégin-Colin S, Choueikani F, Pichon BP. Strong interfacial coupling through exchange interactions in soft/hard core-shell nanoparticles as a function of cationic distribution. NANOSCALE 2019; 11:12946-12958. [PMID: 31259329 DOI: 10.1039/c9nr02323b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Exchange coupled core-shell nanoparticles present high potential to tune adequately the magnetic properties for specific applications such as nanomedicine or spintronics. Here, we report on the design of core-shell nanoparticles by performing the successive thermal decomposition of Fe and Co complexes. Depending on the thermal stability and the concentration of the Co precursor, we were able to control the formation of a hard ferrimagnetic (FiM) Co-ferrite shell or an antiferromagnetic (AFM) CoO shell at the surface of a soft FiM Fe3-δO4 core. The formation of the Co-ferrite shell was also found to occur through two different mechanisms: the diffusion of Co or the growth at the iron oxide surface. The structural properties of core-shell nanoparticles were investigated by a wide panel of techniques such as HAADF, STEM and XRD. The distribution of Fe and Co elements in the crystal structure was described accurately by XAS and XMCD. The operating conditions influenced significantly the oxidation rate of Fe2+ in the core as well as the occupancy of Oh sites by Fe2+ and Co2+ cations. The structural properties of nanoparticles were correlated with their magnetic properties which were investigated by SQUID magnetometry. Each core-shell nanoparticle displayed enhanced effective magnetic anisotropy energy (Eeff) in comparison with pristine Fe3-δO4 nanoparticles because of magnetic coupling at the core-shell interface. The Co-ferrite FiM shells resulted in better enhancement of Eeff than a CoO AFM shell. In addition, the magnetic properties were also influenced by the core size. The coercive field (HC) was increased by core reduction while the blocking temperature (TB) was increased by a larger core. Element-specific XMCD measurements showed the fine coupling of Fe and Co cations which agree with Co-ferrite in each sample, e.g. the formation of a Co-doped interfacial layer in the Fe3-δO4@CoO nanoparticles.
Collapse
Affiliation(s)
- Kevin Sartori
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, F-67000 Strasbourg, France. and Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin - BP48, 91192 Gif-sur-Yvette, France
| | - Geoffrey Cotin
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, F-67000 Strasbourg, France.
| | - Corinne Bouillet
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, F-67000 Strasbourg, France.
| | - Valérie Halté
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, F-67000 Strasbourg, France.
| | - Sylvie Bégin-Colin
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, F-67000 Strasbourg, France.
| | - Fadi Choueikani
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin - BP48, 91192 Gif-sur-Yvette, France
| | - Benoit P Pichon
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, F-67000 Strasbourg, France. and Institut Universitaire de France, 1 rue Descartes, 75231 Paris Cedex 05, France
| |
Collapse
|
26
|
Sartori K, Choueikani F, Gloter A, Begin-Colin S, Taverna D, Pichon BP. Room Temperature Blocked Magnetic Nanoparticles Based on Ferrite Promoted by a Three-Step Thermal Decomposition Process. J Am Chem Soc 2019; 141:9783-9787. [PMID: 31149820 DOI: 10.1021/jacs.9b03965] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Exchange coupled nanoparticles that combine hard and soft magnetic phases are very promising to enhance the effective magnetic anisotropy while preserving sizes below 20 nm. However, the core-shell structure is usually insufficient to produce rare earth-free ferro(i)magnetic blocked nanoparticles at room temperature. We report on onion-type magnetic nanoparticles prepared by a three-step seed mediated growth based on the thermal decomposition method. The core@shell@shell structure consists of a core and an external shell of Fe3-δO4 separated by an intermediate Co-doped ferrite shell. The double exchange coupling at both core@shell and shell@shell interfaces results in such an increased of the magnetic anisotropy energy, that onion-type nanoparticles of 16 nm mainly based on iron oxide are blocked at room temperature. We envision that these results are very appealing for potential applications based on permanent magnets.
Collapse
Affiliation(s)
- Kevin Sartori
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 , F-67000 Strasbourg , France.,Synchrotron SOLEIL , L'Orme des Merisiers, Saint Aubin - BP48, 91192 Gif-sur-Yvette , France
| | - Fadi Choueikani
- Synchrotron SOLEIL , L'Orme des Merisiers, Saint Aubin - BP48, 91192 Gif-sur-Yvette , France
| | - Alexandre Gloter
- Laboratoire de Physique des Solides, CNRS , Université Paris-Sud UMR 8502, 91400 Orsay , France
| | - Sylvie Begin-Colin
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 , F-67000 Strasbourg , France
| | - Dario Taverna
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université , 75005 Paris , France
| | - Benoit P Pichon
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 , F-67000 Strasbourg , France.,Institut Universitaire de France , 1 rue Descartes , 75231 Paris Cedex 05 , France
| |
Collapse
|
27
|
Liu H, Cao J, Wang Y, Chen Z, Yu H, Zhang L, Xu Z, Guo Z, Zhang X, Zhen X, Zou Y, Tai R. Soft x-ray spectroscopic endstation at beamline 08U1A of Shanghai Synchrotron Radiation Facility. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2019; 90:043103. [PMID: 31042997 DOI: 10.1063/1.5080760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Accepted: 03/15/2019] [Indexed: 06/09/2023]
Abstract
A spectroscopic endstation with magnetic field, voltage, and low temperature control has been installed and commissioned at the soft X-ray beamline 08U1A of Shanghai Synchrotron Radiation Facility, which can obtain a magnetic field up to ±0.53 T, applied current and bias voltage, and cryogenic temperatures down to 14 K with a Gifford-McMahon cycle cryocooler. The endstation can perform soft X-ray absorption spectroscopy methods including total electron yield, fluorescence yield, and X-ray excited optical luminance. Combined with an elliptically polarized undulator and the in situ conditions, the endstation can effectively perform X-ray magnetic circular and linear dichroism experiments in the soft X-ray range between photon energies of 250 and 2000 eV.
Collapse
Affiliation(s)
- Haigang Liu
- Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - Jiefeng Cao
- Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - Yong Wang
- Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - Zhenhua Chen
- Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - Huaina Yu
- Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - Lijuan Zhang
- Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - Zijian Xu
- Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - Zhi Guo
- Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - Xiangzhi Zhang
- Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - Xiangjun Zhen
- Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - Ying Zou
- Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| | - Renzhong Tai
- Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
| |
Collapse
|
28
|
Annese E, Di Santo G, Choueikani F, Otero E, Ohresser P. Iron Phthalocyanine and Ferromagnetic Thin Films: Magnetic Behavior of Single and Double Interfaces. ACS OMEGA 2019; 4:5076-5082. [PMID: 31459685 PMCID: PMC6648276 DOI: 10.1021/acsomega.9b00214] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Accepted: 02/19/2019] [Indexed: 06/10/2023]
Abstract
Metal-phthalocyanines are quasi-planar heterocyclic macrocycle molecules with a highly conjugated structure. They can be engineered at the molecular scale (central atom, ligand) to tailor new properties for organic spintronics devices. In this study, we evaluated the magnetic behavior of FePc in a ∼1 nm molecular film sandwiched between two ferromagnetic films: cobalt (bottom) and nickel (top). In the single interface, FePc in contact with a Co film is magnetically coupled with the inorganic film magnetization, though the relatively small Fe(Pc) X-ray magnetic circular dichroism (XMCD) signal in remanence, with respect to that observed in applied field of 6 T, suggests that a fraction of molecules in the organometallic film have their magnetic moment not aligned or antiparallel with respect to Co. When in contact with two interfaces, Fe(Pc) XMCD doubles, indicating that part of the Fe(Pc) are now aligned with the Ni topmost layer, saturated at 1 T. We discussed the relevance of the finding in terms of understanding and developing hybrid organic/inorganic spin devices.
Collapse
Affiliation(s)
- Emilia Annese
- ELETTRA
- Sincrotrone Trieste S.C.p.A., SS 14 - km 163,5 in AREA Science Park, 34149 Trieste, Italy
- Programa
de Engenharia Química, COPPE, Universidade Federal de Rio de Janeiro, 21941-901 Rio de Janeiro, RJ, Brazil
| | - Giovanni Di Santo
- ELETTRA
- Sincrotrone Trieste S.C.p.A., SS 14 - km 163,5 in AREA Science Park, 34149 Trieste, Italy
- Consorzio
INSTM UdR Trieste-ST, via G. Giusti 9, 50121 Firenze, Italy
| | - Fadi Choueikani
- Synchrotron
SOLEIL, L’Orme des Merisiers, Saint-Aubin, BP48, 91192 Gif-sur-Yvette, France
| | - Edwige Otero
- Synchrotron
SOLEIL, L’Orme des Merisiers, Saint-Aubin, BP48, 91192 Gif-sur-Yvette, France
| | - Philippe Ohresser
- Synchrotron
SOLEIL, L’Orme des Merisiers, Saint-Aubin, BP48, 91192 Gif-sur-Yvette, France
| |
Collapse
|
29
|
Capiod P, Bardotti L, Tamion A, Boisron O, Albin C, Dupuis V, Renaud G, Ohresser P, Tournus F. Elaboration of Nanomagnet Arrays: Organization and Magnetic Properties of Mass-Selected FePt Nanoparticles Deposited on Epitaxially Grown Graphene on Ir(111). PHYSICAL REVIEW LETTERS 2019; 122:106802. [PMID: 30932671 DOI: 10.1103/physrevlett.122.106802] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Revised: 01/25/2019] [Indexed: 06/09/2023]
Abstract
The moiré pattern created by the epitaxy of a graphene sheet on an iridium substrate can be used as a template for the growth of 2D atomic or cluster arrays. We observed for the first time a coherent organization of hard magnetic preformed FePt nanoparticles on the 2D lattice of graphene on Ir(111). Nanoparticles of 2 nm diameter have been mass selected in a gas phase and deposited with low energy on the hexagonal moiré pattern. Their morphology and organization have been investigated using grazing incidence small angle x-ray scattering, while their magnetic properties have been studied by x-ray magnetic circular dichroism, both pointing to a FePt cluster-graphene surface specific interaction. The spatial coherence of the nanoparticles is preserved upon annealing up to 700 °C where the hard magnetic phase of FePt is obtained.
Collapse
Affiliation(s)
- Pierre Capiod
- Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France
| | - Laurent Bardotti
- Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France
| | - Alexandre Tamion
- Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France
| | - Olivier Boisron
- Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France
| | - Clément Albin
- Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France
| | - Véronique Dupuis
- Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France
| | - Gilles Renaud
- Université Grenoble Alpes, CEA, INAC, MEM, F-38000 Grenoble, France
| | - Philippe Ohresser
- Synchrotron SOLEIL, L'Orme des Merisiers, BP48, Saint-Aubin, 91192 Gif-sur-Yvette, France
| | - Florent Tournus
- Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France
| |
Collapse
|
30
|
Jafri SF, Koumousi ES, Arrio MA, Juhin A, Mitcov D, Rouzières M, Dechambenoit P, Li D, Otero E, Wilhelm F, Rogalev A, Joly L, Kappler JP, Cartier dit Moulin C, Mathonière C, Clérac R, Sainctavit P. Atomic Scale Evidence of the Switching Mechanism in a Photomagnetic CoFe Dinuclear Prussian Blue Analogue. J Am Chem Soc 2018; 141:3470-3479. [DOI: 10.1021/jacs.8b10484] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Sadaf Fatima Jafri
- IMPMC, CNRS, Sorbonne Université, IRD, MNHN, UMR7590, F-75005 Paris, France
| | - Evangelia S. Koumousi
- CNRS, ICMCB, UMR5026, F-33600 Pessac, France
- Univ. Bordeaux, ICMCB, UMR5026, F-33600 Pessac, France
- CNRS, CRPP, UMR5031, F-33600 Pessac, France
- Univ. Bordeaux, CRPP, UMR5031, F-33600 Pessac, France
| | - Marie-Anne Arrio
- IMPMC, CNRS, Sorbonne Université, IRD, MNHN, UMR7590, F-75005 Paris, France
| | - Amélie Juhin
- IMPMC, CNRS, Sorbonne Université, IRD, MNHN, UMR7590, F-75005 Paris, France
| | - Dmitri Mitcov
- CNRS, CRPP, UMR5031, F-33600 Pessac, France
- Univ. Bordeaux, CRPP, UMR5031, F-33600 Pessac, France
| | - Mathieu Rouzières
- CNRS, CRPP, UMR5031, F-33600 Pessac, France
- Univ. Bordeaux, CRPP, UMR5031, F-33600 Pessac, France
| | - Pierre Dechambenoit
- CNRS, CRPP, UMR5031, F-33600 Pessac, France
- Univ. Bordeaux, CRPP, UMR5031, F-33600 Pessac, France
| | - Dongfeng Li
- College of Chemistry, Central China Normal University, 430079 Wuhan, P. R. China
| | - Edwige Otero
- Synchrotron SOLEIL, L’Orme des Merisiers, F-91192 Saint-Aubin, France
| | - Fabrice Wilhelm
- European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble, France
| | - Andrei Rogalev
- European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble, France
| | - Loïc Joly
- Synchrotron SOLEIL, L’Orme des Merisiers, F-91192 Saint-Aubin, France
- Université de Strasbourg, CNRS, IPCMS, UMR7504, F-67000 Strasbourg, France
| | - Jean-Paul Kappler
- Synchrotron SOLEIL, L’Orme des Merisiers, F-91192 Saint-Aubin, France
- Université de Strasbourg, CNRS, IPCMS, UMR7504, F-67000 Strasbourg, France
| | | | - Corine Mathonière
- CNRS, ICMCB, UMR5026, F-33600 Pessac, France
- Univ. Bordeaux, ICMCB, UMR5026, F-33600 Pessac, France
| | - Rodolphe Clérac
- CNRS, CRPP, UMR5031, F-33600 Pessac, France
- Univ. Bordeaux, CRPP, UMR5031, F-33600 Pessac, France
| | - Philippe Sainctavit
- IMPMC, CNRS, Sorbonne Université, IRD, MNHN, UMR7590, F-75005 Paris, France
- Synchrotron SOLEIL, L’Orme des Merisiers, F-91192 Saint-Aubin, France
| |
Collapse
|
31
|
Kappler JP, Otero E, Li W, Joly L, Schmerber G, Muller B, Scheurer F, Leduc F, Gobaut B, Poggini L, Serrano G, Choueikani F, Lhotel E, Cornia A, Sessoli R, Mannini M, Arrio MA, Sainctavit P, Ohresser P. Ultralow-temperature device dedicated to soft X-ray magnetic circular dichroism experiments. JOURNAL OF SYNCHROTRON RADIATION 2018; 25:1727-1735. [PMID: 30407183 PMCID: PMC6225739 DOI: 10.1107/s1600577518012717] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Accepted: 09/07/2018] [Indexed: 06/08/2023]
Abstract
A new ultralow-temperature setup dedicated to soft X-ray absorption spectroscopy and X-ray magnetic circular dichroism (XMCD) experiments is described. Two experiments, performed on the DEIMOS beamline (SOLEIL synchrotron), demonstrate the outstanding performance of this new platform in terms of the lowest achievable temperature under X-ray irradiation (T = 220 mK), the precision in controlling the temperature during measurements as well as the speed of the cooling-down and warming-up procedures. Moreover, owing to the new design of the setup, the eddy-current power is strongly reduced, allowing fast scanning of the magnetic field in XMCD experiments; these performances lead to a powerful device for X-ray spectroscopies on synchrotron-radiation beamlines facilities.
Collapse
Affiliation(s)
- J.-P. Kappler
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, 91192 Gif-sur-Yvette, France
| | - E. Otero
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, 91192 Gif-sur-Yvette, France
| | - W. Li
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, 91192 Gif-sur-Yvette, France
| | - L. Joly
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, 91192 Gif-sur-Yvette, France
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, 23 rue du Loess, 67034 Strasbourg, France
| | - G. Schmerber
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, 23 rue du Loess, 67034 Strasbourg, France
| | - B. Muller
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, 23 rue du Loess, 67034 Strasbourg, France
| | - F. Scheurer
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, 91192 Gif-sur-Yvette, France
- Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, 23 rue du Loess, 67034 Strasbourg, France
| | - F. Leduc
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, 91192 Gif-sur-Yvette, France
| | - B. Gobaut
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, 91192 Gif-sur-Yvette, France
| | - L. Poggini
- Department of Chemistry ‘U. Schiff’ and INSTM RU, University of Firenze, Via della Lastruccia n. 3, 50019 Sesto Fiorentino (FI), Italy
| | - G. Serrano
- Department of Chemistry ‘U. Schiff’ and INSTM RU, University of Firenze, Via della Lastruccia n. 3, 50019 Sesto Fiorentino (FI), Italy
| | - F. Choueikani
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, 91192 Gif-sur-Yvette, France
| | - E. Lhotel
- Institut Néel, 25 rue des Martyrs, 38042 Grenoble, France
| | - A. Cornia
- Department of Chemical and Geological Sciences and INSTM RU, University of Modena and Reggio Emilia, via G. Campi 103, I-41125 Modena, Italy
| | - R. Sessoli
- Department of Chemistry ‘U. Schiff’ and INSTM RU, University of Firenze, Via della Lastruccia n. 3, 50019 Sesto Fiorentino (FI), Italy
| | - M. Mannini
- Department of Chemistry ‘U. Schiff’ and INSTM RU, University of Firenze, Via della Lastruccia n. 3, 50019 Sesto Fiorentino (FI), Italy
| | - M.-A. Arrio
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, CNRS, Sorbonne Université, IRD, MNHN, UMR 7590, 4 place Jussieu, 75252 Paris Cedex 05, France
| | - Ph. Sainctavit
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, 91192 Gif-sur-Yvette, France
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, CNRS, Sorbonne Université, IRD, MNHN, UMR 7590, 4 place Jussieu, 75252 Paris Cedex 05, France
| | - P. Ohresser
- Synchrotron SOLEIL, L’Orme des Merisiers, BP 48, 91192 Gif-sur-Yvette, France
| |
Collapse
|
32
|
Schleicher F, Studniarek M, Kumar KS, Urbain E, Katcko K, Chen J, Frauhammer T, Hervé M, Halisdemir U, Kandpal LM, Lacour D, Riminucci A, Joly L, Scheurer F, Gobaut B, Choueikani F, Otero E, Ohresser P, Arabski J, Schmerber G, Wulfhekel W, Beaurepaire E, Weber W, Boukari S, Ruben M, Bowen M. Linking Electronic Transport through a Spin Crossover Thin Film to the Molecular Spin State Using X-ray Absorption Spectroscopy Operando Techniques. ACS APPLIED MATERIALS & INTERFACES 2018; 10:31580-31585. [PMID: 30136570 DOI: 10.1021/acsami.8b11495] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
One promising route toward encoding information is to utilize the two stable electronic states of a spin crossover molecule. Although this property is clearly manifested in transport across single molecule junctions, evidence linking charge transport across a solid-state device to the molecular film's spin state has thus far remained indirect. To establish this link, we deploy materials-centric and device-centric operando experiments involving X-ray absorption spectroscopy. We find a correlation between the temperature dependencies of the junction resistance and the Fe spin state within the device's [Fe(H2B(pz)2)2(NH2-phen)] molecular film. We also factually observe that the Fe molecular site mediates charge transport. Our dual operando studies reveal that transport involves a subset of molecules within an electronically heterogeneous spin crossover film. Our work confers an insight that substantially improves the state-of-the-art regarding spin crossover-based devices, thanks to a methodology that can benefit device studies of other next-generation molecular compounds.
Collapse
Affiliation(s)
- Filip Schleicher
- IPCMS, UMR 7504 CNRS, Université de Strasbourg , 23 Rue du Loess, BP 43 , 67034 Strasbourg Cedex 2, France
- Université de Lorraine, CNRS, IJL , F-54000 Nancy , France
| | - Michał Studniarek
- IPCMS, UMR 7504 CNRS, Université de Strasbourg , 23 Rue du Loess, BP 43 , 67034 Strasbourg Cedex 2, France
| | - Kuppusamy Senthil Kumar
- IPCMS, UMR 7504 CNRS, Université de Strasbourg , 23 Rue du Loess, BP 43 , 67034 Strasbourg Cedex 2, France
| | - Etienne Urbain
- IPCMS, UMR 7504 CNRS, Université de Strasbourg , 23 Rue du Loess, BP 43 , 67034 Strasbourg Cedex 2, France
| | - Kostantine Katcko
- IPCMS, UMR 7504 CNRS, Université de Strasbourg , 23 Rue du Loess, BP 43 , 67034 Strasbourg Cedex 2, France
| | - Jinjie Chen
- Physikalisches Institut , Karlsruhe Institute of Technology , Wolfgang-Gaede-Str. 1 , 76131 Karlsruhe , Germany
| | - Timo Frauhammer
- Physikalisches Institut , Karlsruhe Institute of Technology , Wolfgang-Gaede-Str. 1 , 76131 Karlsruhe , Germany
| | - Marie Hervé
- Physikalisches Institut , Karlsruhe Institute of Technology , Wolfgang-Gaede-Str. 1 , 76131 Karlsruhe , Germany
| | - Ufuk Halisdemir
- IPCMS, UMR 7504 CNRS, Université de Strasbourg , 23 Rue du Loess, BP 43 , 67034 Strasbourg Cedex 2, France
| | - Lalit Mohan Kandpal
- IPCMS, UMR 7504 CNRS, Université de Strasbourg , 23 Rue du Loess, BP 43 , 67034 Strasbourg Cedex 2, France
| | - Daniel Lacour
- Université de Lorraine, CNRS, IJL , F-54000 Nancy , France
| | | | - Loic Joly
- IPCMS, UMR 7504 CNRS, Université de Strasbourg , 23 Rue du Loess, BP 43 , 67034 Strasbourg Cedex 2, France
| | - Fabrice Scheurer
- IPCMS, UMR 7504 CNRS, Université de Strasbourg , 23 Rue du Loess, BP 43 , 67034 Strasbourg Cedex 2, France
| | - Benoit Gobaut
- Synchrotron SOLEIL, L'Orme des Merisiers , Saint-Aubin, BP 48 , 91192 Gif-sur-Yvette , France
| | - Fadi Choueikani
- Synchrotron SOLEIL, L'Orme des Merisiers , Saint-Aubin, BP 48 , 91192 Gif-sur-Yvette , France
| | - Edwige Otero
- Synchrotron SOLEIL, L'Orme des Merisiers , Saint-Aubin, BP 48 , 91192 Gif-sur-Yvette , France
| | - Philippe Ohresser
- Synchrotron SOLEIL, L'Orme des Merisiers , Saint-Aubin, BP 48 , 91192 Gif-sur-Yvette , France
| | - Jacek Arabski
- IPCMS, UMR 7504 CNRS, Université de Strasbourg , 23 Rue du Loess, BP 43 , 67034 Strasbourg Cedex 2, France
| | - Guy Schmerber
- IPCMS, UMR 7504 CNRS, Université de Strasbourg , 23 Rue du Loess, BP 43 , 67034 Strasbourg Cedex 2, France
| | - Wulf Wulfhekel
- Physikalisches Institut , Karlsruhe Institute of Technology , Wolfgang-Gaede-Str. 1 , 76131 Karlsruhe , Germany
- Institute of Nanotechnology , Karlsruhe Institute of Technology (KIT) , Hermann-von-Helmholtz-Platz 1 , 76344 Eggenstein-Leopoldshafen , Germany
| | - Eric Beaurepaire
- IPCMS, UMR 7504 CNRS, Université de Strasbourg , 23 Rue du Loess, BP 43 , 67034 Strasbourg Cedex 2, France
| | - Wolfgang Weber
- IPCMS, UMR 7504 CNRS, Université de Strasbourg , 23 Rue du Loess, BP 43 , 67034 Strasbourg Cedex 2, France
| | - Samy Boukari
- IPCMS, UMR 7504 CNRS, Université de Strasbourg , 23 Rue du Loess, BP 43 , 67034 Strasbourg Cedex 2, France
| | - Mario Ruben
- IPCMS, UMR 7504 CNRS, Université de Strasbourg , 23 Rue du Loess, BP 43 , 67034 Strasbourg Cedex 2, France
- Institute of Nanotechnology , Karlsruhe Institute of Technology (KIT) , Hermann-von-Helmholtz-Platz 1 , 76344 Eggenstein-Leopoldshafen , Germany
| | - Martin Bowen
- IPCMS, UMR 7504 CNRS, Université de Strasbourg , 23 Rue du Loess, BP 43 , 67034 Strasbourg Cedex 2, France
| |
Collapse
|
33
|
Jedrecy N, Aghavnian T, Moussy JB, Magnan H, Stanescu D, Portier X, Arrio MA, Mocuta C, Vlad A, Belkhou R, Ohresser P, Barbier A. Cross-Correlation between Strain, Ferroelectricity, and Ferromagnetism in Epitaxial Multiferroic CoFe 2O 4/BaTiO 3 Heterostructures. ACS APPLIED MATERIALS & INTERFACES 2018; 10:28003-28014. [PMID: 30085643 DOI: 10.1021/acsami.8b09499] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Multiferroic biphase systems with robust ferromagnetic and ferroelectric response at room temperature would be ideally suitable for voltage-controlled nonvolatile memories. Understanding the role of strain and charges at interfaces is central for an accurate control of the ferroelectricity as well as of the ferromagnetism. In this paper, we probe the relationship between the strain and the ferromagnetic/ferroelectric properties in the layered CoFe2O4/BaTiO3 (CFO/BTO) model system. For this purpose, ultrathin epitaxial bilayers, ranging from highly strained to fully relaxed, were grown by molecular beam epitaxy on Nb:SrTiO3(001). The lattice characteristics, determined by X-ray diffraction, evidence a non-intuitive cross-correlation: the strain in the bottom BTO layer depends on the thickness of the top CFO layer and vice versa. Plastic deformation participates in the relaxation process through dislocations at both interfaces, revealed by electron microscopy. Importantly, the switching of the BTO ferroelectric polarization, probed by piezoresponse force microscopy, is found dependent on the CFO thickness: the larger is the latter, the easiest is the BTO switching. In the thinnest thickness regime, the tetragonality of BTO and CFO has a strong impact on the 3d electronic levels of the different cations, which were probed by X-ray linear dichroism. The quantitative determination of the nature and repartition of the magnetic ions in CFO, as well as of their magnetic moments, has been carried out by X-ray magnetic circular dichroism, with the support of multiplet calculations. While bulklike ferrimagnetism is found for 5-15 nm thick CFO layers with a magnetization resulting as expected from the Co2+ ions alone, important changes occur at the interface with BTO over a thickness of 2-3 nm because of the formation of Fe2+ and Co3+ ions. This oxidoreduction process at the interface has strong implications concerning the mechanisms of polarity compensation and coupling in multiferroic heterostructures.
Collapse
Affiliation(s)
- Nathalie Jedrecy
- Institut des Nano Sciences de Paris (INSP) , Sorbonne Université, CNRS UMR 7588 , 4 Place Jussieu , 75252 Paris Cedex 05 , France
| | - Thomas Aghavnian
- Service de Physique de l'Etat Condensé (SPEC), CEA, CNRS UMR 3680, Université Paris Saclay, Orme des Merisiers, CEA Saclay , 91191 Gif sur Yvette Cedex , France
| | - Jean-Baptiste Moussy
- Service de Physique de l'Etat Condensé (SPEC), CEA, CNRS UMR 3680, Université Paris Saclay, Orme des Merisiers, CEA Saclay , 91191 Gif sur Yvette Cedex , France
| | - Hélène Magnan
- Service de Physique de l'Etat Condensé (SPEC), CEA, CNRS UMR 3680, Université Paris Saclay, Orme des Merisiers, CEA Saclay , 91191 Gif sur Yvette Cedex , France
| | - Dana Stanescu
- Service de Physique de l'Etat Condensé (SPEC), CEA, CNRS UMR 3680, Université Paris Saclay, Orme des Merisiers, CEA Saclay , 91191 Gif sur Yvette Cedex , France
| | - Xavier Portier
- Centre de recherche sur les Ions, les MAtériaux et la Photonique (CIMAP), CEA, CNRS UMR 6252, ENSICAEN, Normandie Université , 6 Boulevard Maréchal Juin , 14050 Caen , France
| | - Marie-Anne Arrio
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université, CNRS UMR 7590, IRD, MNHN , 4 Place Jussieu , 75252 Paris Cedex 05 , France
| | - Cristian Mocuta
- Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin , BP 48, 91192 Gif sur Yvette Cedex , France
| | - Alina Vlad
- Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin , BP 48, 91192 Gif sur Yvette Cedex , France
| | - Rachid Belkhou
- Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin , BP 48, 91192 Gif sur Yvette Cedex , France
| | - Philippe Ohresser
- Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin , BP 48, 91192 Gif sur Yvette Cedex , France
| | - Antoine Barbier
- Service de Physique de l'Etat Condensé (SPEC), CEA, CNRS UMR 3680, Université Paris Saclay, Orme des Merisiers, CEA Saclay , 91191 Gif sur Yvette Cedex , France
| |
Collapse
|
34
|
Jafri SF, Arrio MA, Bordage A, Moulin R, Juhin A, Cartier dit Moulin C, Otero E, Ohresser P, Bleuzen A, Sainctavit P. Weak Ferromagnetic Interaction at the Surface of the Ferrimagnetic Rb2Co4[Fe(CN)6]3.3·11H2O Photoexcited State. Inorg Chem 2018; 57:7610-7619. [DOI: 10.1021/acs.inorgchem.8b00508] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sadaf Fatima Jafri
- CNRS, Sorbonne Université, IRD, MNHN, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, 75252 Paris cedex 05, France
| | - Marie-Anne Arrio
- CNRS, Sorbonne Université, IRD, MNHN, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, 75252 Paris cedex 05, France
| | - Amélie Bordage
- Institut de Chimie Moléculaire et des Matériaux d’Orsay, Université Paris-Sud, CNRS, Université Paris-Saclay, 91405 Orsay cedex, France
| | - Robinson Moulin
- Institut de Chimie Moléculaire et des Matériaux d’Orsay, Université Paris-Sud, CNRS, Université Paris-Saclay, 91405 Orsay cedex, France
| | - Amélie Juhin
- CNRS, Sorbonne Université, IRD, MNHN, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, 75252 Paris cedex 05, France
| | | | - Edwige Otero
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, France
| | | | - Anne Bleuzen
- Institut de Chimie Moléculaire et des Matériaux d’Orsay, Université Paris-Sud, CNRS, Université Paris-Saclay, 91405 Orsay cedex, France
| | - Philippe Sainctavit
- CNRS, Sorbonne Université, IRD, MNHN, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, 75252 Paris cedex 05, France
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, France
| |
Collapse
|
35
|
Influence of Organic Ligands on the Surface Oxidation State and Magnetic Properties of Iron Oxide Particles. Z PHYS CHEM 2018. [DOI: 10.1515/zpch-2017-1084] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
For the application of iron oxide nanoparticles from thermal decomposition approaches as contrast agents in magnetic resonance imaging (MRI), their initial hydrophobic ligands have to be replaced by hydrophilic ones. This exchange can influence the surface oxidation state and the magnetic properties of the particles. Here, the effect of the anchor group of three organic ligands, citric acid and two catechols, dihydrocaffeic acid and its nitrated derivative nitro dihydrocaffeic acid on iron oxide nanoparticles is evaluated. The oleate ligands of Fe3O4/γ-Fe2O3 nanoparticles prepared by the thermal decomposition of iron oleate were exchanged against the hydrophilic ligands. X-ray absorption spectroscopy, especially X-ray magnetic circular dichroism (XMCD) measurements in the total electron yield (TEY) mode was used to investigate local magnetic and electronic properties of the particles’ surface region before and after the ligand exchange. XMCD was combined with charge transfer multiplet calculations which provide information on the contributions of Fe2+ and Fe3+ at different lattice sites, i.e. either in tetrahedral or octahedral environment. The obtained data demonstrate that nitro hydrocaffeic acid leads to least reduction of the magnetizability of the surface region of the iron oxide nanoparticles compared to the two other ligands. For all hydrophilic samples, the proportion of Fe3+ ions in octahedral sites increases at the expense of the Fe2+ in octahedral sites whereas the percentage of Fe3+ in tetrahedral sites hardly changes. These observations suggest that an oxidation process took place, but a selective decrease of the Fe2+ ions in octahedral sites ions due to surface dissolution processes is unlikely. The citrate ligand has the least oxidative effect, whereas the degree of oxidation was similar for both catechol ligands regardless of the nitro group. Twenty-four hours of incubation in isotonic saline has nearly no influences on the magnetic properties of the nanoparticles, the least on those with the nitrated hydrocaffeic acid ligand.
Collapse
|
36
|
Pedrini A, Poggini L, Tudisco C, Torelli M, Giuffrida AE, Bertani F, Cimatti I, Otero E, Ohresser P, Sainctavit P, Suman M, Condorelli GG, Mannini M, Dalcanale E. Self-Assembly of TbPc 2 Single-Molecule Magnets on Surface through Multiple Hydrogen Bonding. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2018; 14:1702572. [PMID: 29226595 DOI: 10.1002/smll.201702572] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 09/26/2017] [Indexed: 06/07/2023]
Abstract
The complexation between 2-ureido-4[1H]-pyrimidinone (UPy) and 2,7-diamido-1,8-naphthyridine (NaPy) is used to promote the mild chemisorption of a UPy-functionalized terbium(III) double decker system on a silicon surface. The adopted strategy allows the single-molecule magnet behavior of the system to be maintained unaltered on the surface.
Collapse
Affiliation(s)
- Alessandro Pedrini
- Department of Chemistry, Life Sciences and Environmental Sustainability & INSTM RU of Parma, Parco delle Scienze 17/A, 43124, Parma, Italy
| | - Lorenzo Poggini
- Department of Chemistry "Ugo Schiff" & INSTM RU of Firenze University of Firenze, Via della Lastruccia 3, 50019, Sesto Fiorentino, Italy
| | - Cristina Tudisco
- Department of Chemical Science & INSTM RU of Catania, University of Catania, Viale Andrea Doria 6, Catania, Italy
| | - Martina Torelli
- Department of Chemistry, Life Sciences and Environmental Sustainability & INSTM RU of Parma, Parco delle Scienze 17/A, 43124, Parma, Italy
| | - Antonino E Giuffrida
- Department of Chemical Science & INSTM RU of Catania, University of Catania, Viale Andrea Doria 6, Catania, Italy
| | - Federico Bertani
- Department of Chemistry, Life Sciences and Environmental Sustainability & INSTM RU of Parma, Parco delle Scienze 17/A, 43124, Parma, Italy
| | - Irene Cimatti
- Department of Chemistry "Ugo Schiff" & INSTM RU of Firenze University of Firenze, Via della Lastruccia 3, 50019, Sesto Fiorentino, Italy
| | - Edwige Otero
- Synchrotron SOLEIL, L'Orme des Merisiers Saint Aubin, BP 48, 91192, Gif sur Yvette, France
| | - Philippe Ohresser
- Synchrotron SOLEIL, L'Orme des Merisiers Saint Aubin, BP 48, 91192, Gif sur Yvette, France
| | - Philippe Sainctavit
- Synchrotron SOLEIL, L'Orme des Merisiers Saint Aubin, BP 48, 91192, Gif sur Yvette, France
- IMPMC-UMR7590, CNRS, UPMC, IRD, MNHN, 4 place Jussieu, 75005, Paris, France
| | - Michele Suman
- Barilla G.R. F.lli SpA, Advanced Laboratory Research, Via Mantova 166, 43122, Parma, Italy
| | - Guglielmo G Condorelli
- Department of Chemical Science & INSTM RU of Catania, University of Catania, Viale Andrea Doria 6, Catania, Italy
| | - Matteo Mannini
- Department of Chemistry "Ugo Schiff" & INSTM RU of Firenze University of Firenze, Via della Lastruccia 3, 50019, Sesto Fiorentino, Italy
| | - Enrico Dalcanale
- Department of Chemistry, Life Sciences and Environmental Sustainability & INSTM RU of Parma, Parco delle Scienze 17/A, 43124, Parma, Italy
| |
Collapse
|
37
|
Li J, Menguy N, Arrio MA, Sainctavit P, Juhin A, Wang Y, Chen H, Bunau O, Otero E, Ohresser P, Pan Y. Controlled cobalt doping in the spinel structure of magnetosome magnetite: new evidences from element- and site-specific X-ray magnetic circular dichroism analyses. J R Soc Interface 2017; 13:rsif.2016.0355. [PMID: 27512138 DOI: 10.1098/rsif.2016.0355] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 07/14/2016] [Indexed: 02/05/2023] Open
Abstract
The biomineralization of magnetite nanocrystals (called magnetosomes) by magnetotactic bacteria (MTB) has attracted intense interest in biology, geology and materials science due to the precise morphology of the particles, the chain-like assembly and their unique magnetic properties. Great efforts have been recently made in producing transition metal-doped magnetosomes with modified magnetic properties for a range of applications. Despite some successful outcomes, the coordination chemistry and magnetism of such metal-doped magnetosomes still remain largely unknown. Here, we present new evidences from X-ray magnetic circular dichroism (XMCD) for element- and site-specific magnetic analyses that cobalt is incorporated in the spinel structure of the magnetosomes within Magnetospirillum magneticum AMB-1 through the replacement of Fe(2+) ions by Co(2+) ions in octahedral (Oh) sites of magnetite. Both XMCD at Fe and Co L2,3 edges, and energy-dispersive X-ray spectroscopy on transmission electron microscopy analyses reveal a heterogeneous distribution of cobalt occurring either in different particles or inside individual particles. Compared with non-doped one, cobalt-doped magnetosome sample has lower Verwey transition temperature and larger magnetic coercivity, related to the amount of doped cobalt. This study also demonstrates that the addition of trace cobalt in the growth medium can significantly improve both the cell growth and the magnetosome formation within M. magneticum AMB-1. Together with the cobalt occupancy within the spinel structure of magnetosomes, this study indicates that MTB may provide a promising biomimetic system for producing chains of metal-doped single-domain magnetite with an appropriate tuning of the magnetic properties for technological and biomedical applications.
Collapse
Affiliation(s)
- Jinhua Li
- Paleomagnetism and Geochronology Laboratory, Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Beijing 100029, People's Republic of China France-China Biomineralization and Nano-structures Laboratory, Chinese Academy of Sciences, Beijing 100029, People's Republic of China
| | - Nicolas Menguy
- France-China Biomineralization and Nano-structures Laboratory, Chinese Academy of Sciences, Beijing 100029, People's Republic of China IMPMC, CNRS UMR 7590, Sorbonne Universités, MNHN, UPMC, IRD UMR 206, 75005 Paris, France
| | - Marie-Anne Arrio
- IMPMC, CNRS UMR 7590, Sorbonne Universités, MNHN, UPMC, IRD UMR 206, 75005 Paris, France
| | - Philippe Sainctavit
- IMPMC, CNRS UMR 7590, Sorbonne Universités, MNHN, UPMC, IRD UMR 206, 75005 Paris, France Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin, 91192 Gif-Sur-Yvette Cedex, France
| | - Amélie Juhin
- IMPMC, CNRS UMR 7590, Sorbonne Universités, MNHN, UPMC, IRD UMR 206, 75005 Paris, France
| | - Yinzhao Wang
- Paleomagnetism and Geochronology Laboratory, Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Beijing 100029, People's Republic of China France-China Biomineralization and Nano-structures Laboratory, Chinese Academy of Sciences, Beijing 100029, People's Republic of China
| | - Haitao Chen
- Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, Sanya 572000, People's Republic of China
| | - Oana Bunau
- IMPMC, CNRS UMR 7590, Sorbonne Universités, MNHN, UPMC, IRD UMR 206, 75005 Paris, France
| | - Edwige Otero
- Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin, 91192 Gif-Sur-Yvette Cedex, France
| | - Philippe Ohresser
- Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin, 91192 Gif-Sur-Yvette Cedex, France
| | - Yongxin Pan
- Paleomagnetism and Geochronology Laboratory, Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Beijing 100029, People's Republic of China France-China Biomineralization and Nano-structures Laboratory, Chinese Academy of Sciences, Beijing 100029, People's Republic of China
| |
Collapse
|
38
|
Kowalska JK, Nayyar B, Rees JA, Schiewer CE, Lee SC, Kovacs JA, Meyer F, Weyhermüller T, Otero E, DeBeer S. Iron L 2,3-Edge X-ray Absorption and X-ray Magnetic Circular Dichroism Studies of Molecular Iron Complexes with Relevance to the FeMoco and FeVco Active Sites of Nitrogenase. Inorg Chem 2017; 56:8147-8158. [PMID: 28653855 PMCID: PMC5516708 DOI: 10.1021/acs.inorgchem.7b00852] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
![]()
Herein, a systematic study of a series
of molecular iron model complexes has been carried out using Fe L2,3-edge X-ray absorption (XAS) and X-ray magnetic circular
dichroism (XMCD) spectroscopies. This series spans iron complexes
of increasing complexity, starting from ferric and ferrous tetrachlorides
([FeCl4]−/2–), to ferric and ferrous
tetrathiolates ([Fe(SR)4]−/2–),
to diferric and mixed-valent iron–sulfur complexes [Fe2S2R4]2–/3–.
This test set of compounds is used to evaluate the sensitivity of
both Fe L2,3-edge XAS and XMCD spectroscopy to oxidation
state and ligation changes. It is demonstrated that the energy shift
and intensity of the L2,3-edge XAS spectra depends on both
the oxidation state and covalency of the system; however, the quantitative
information that can be extracted from these data is limited. On the
other hand, analysis of the Fe XMCD shows distinct changes in the
intensity at both L3 and L2 edges, depending
on the oxidation state of the system. It is also demonstrated that
the XMCD intensity is modulated by the covalency of the system. For
mononuclear systems, the experimental data are correlated with atomic
multiplet calculations in order to provide insights into the experimental
observations. Finally, XMCD is applied to the tetranuclear heterometal–iron–sulfur
clusters [MFe3S4]3+/2+ (M = Mo, V),
which serve as structural analogues of the FeMoco and FeVco active
sites of nitrogenase. It is demonstrated that the XMCD data can be
utilized to obtain information on the oxidation state distribution
in complex clusters that is not readily accessible for the Fe L2,3-edge XAS data alone. The advantages of XMCD relative to
standard K-edge and L2,3-edge XAS are highlighted. This
study provides an important foundation for future XMCD studies on
complex (bio)inorganic systems. A systematic Fe L2,3-edge X-ray absorption (XAS) and X-ray magnetic circular dichroism
(XMCD) study of iron tetrachlorides ([FeCl4]−/2−), iron tetrathiolates ([Fe(SR)4]−/2−), diferric and mixed-valent iron−sulfur dimers [Fe2S2R4]2−/3− and heterometal−iron−sulfur
tetramers [MFe3S4]3+/2+ (M = Mo,
V) is reported. The changes in XAS and XMCD energies and intensities
across this set of complexes are presented together with atomic multiplet
calculations. The advantages of XMCD as an electronic structure probe
of complex clusters are highlighted.
Collapse
Affiliation(s)
- Joanna K Kowalska
- Max Planck Institute for Chemical Energy Conversion , Stiftstraβe 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Brahamjot Nayyar
- Department of Chemistry, University of Waterloo , Waterloo, Ontario, Canada N2L 3G1
| | - Julian A Rees
- Max Planck Institute for Chemical Energy Conversion , Stiftstraβe 34-36, D-45470 Mülheim an der Ruhr, Germany.,Department of Chemistry, University of Washington , Box 351700, Seattle, Washington 98195-1700, United States
| | - Christine E Schiewer
- University of Göttingen, Institute of Inorganic Chemistry , Tammannstraβe 4, D-37007 Göttingen, Germany
| | - Sonny C Lee
- Department of Chemistry, University of Waterloo , Waterloo, Ontario, Canada N2L 3G1
| | - Julie A Kovacs
- Department of Chemistry, University of Washington , Box 351700, Seattle, Washington 98195-1700, United States
| | - Franc Meyer
- University of Göttingen, Institute of Inorganic Chemistry , Tammannstraβe 4, D-37007 Göttingen, Germany
| | - Thomas Weyhermüller
- Max Planck Institute for Chemical Energy Conversion , Stiftstraβe 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Edwige Otero
- SOLEIL, L'Orme des Merisiers , 91190 Saint-Aubin, France
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion , Stiftstraβe 34-36, D-45470 Mülheim an der Ruhr, Germany
| |
Collapse
|
39
|
Ormaza M, Bachellier N, Faraggi MN, Verlhac B, Abufager P, Ohresser P, Joly L, Romeo M, Scheurer F, Bocquet ML, Lorente N, Limot L. Efficient Spin-Flip Excitation of a Nickelocene Molecule. NANO LETTERS 2017; 17:1877-1882. [PMID: 28199115 DOI: 10.1021/acs.nanolett.6b05204] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Inelastic electron tunneling spectroscopy (IETS) within the junction of a scanning tunneling microscope (STM) uses current-driven spin-flip excitations for an all-electrical characterization of the spin state of a single object. Usually decoupling layers between the single object, atom or molecule, and the supporting surface are needed to observe these excitations. Here we study the surface magnetism of a sandwich nickelocene molecule (Nc) adsorbed directly on Cu(100) by means of X-ray magnetic circular dichroism (XMCD) and density functional theory (DFT) calculations and show with IETS that it exhibits an exceptionally efficient spin-flip excitation. The molecule preserves its magnetic moment and magnetic anisotropy not only on Cu(100), but also in different metallic environments including the tip apex. By taking advantage of this robusteness, we are able to functionalize the microscope tip with a Nc, which can be employed as a portable source of inelastic excitations as exemplified by a double spin-flip excitation process.
Collapse
Affiliation(s)
- Maider Ormaza
- Université de Strasbourg , CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, France
| | - Nicolas Bachellier
- Université de Strasbourg , CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, France
| | - Marisa N Faraggi
- Département de Chimie, ENS-CNRS-UPMC UMR 8640, Ecole Normale Supérieure , 75005 Paris, France
| | - Benjamin Verlhac
- Université de Strasbourg , CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, France
| | - Paula Abufager
- Instituto de Física de Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Universidad Nacional de Rosario , Av. Pellegrini 250, 2000 Rosario, Argentina
| | - Philippe Ohresser
- L'Orme des Merisiers, Synchrotron SOLEIL , Saint-Aubin - BP 48, 91192 Gif-sur-Yvette, France
| | - Loïc Joly
- Université de Strasbourg , CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, France
| | - Michelangelo Romeo
- Université de Strasbourg , CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, France
| | - Fabrice Scheurer
- Université de Strasbourg , CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, France
| | - Marie-Laure Bocquet
- Département de Chimie, ENS-CNRS-UPMC UMR 8640, Ecole Normale Supérieure , 75005 Paris, France
| | - Nicolás Lorente
- Centro de Fı́sica de Materiales CFM/MPC (CSIC-UPV/EHU) , Paseo Manuel de Lardizabal 5, 20018 Donostia-San Sebastián, Spain
- Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, E-20018 Donostia-San Sebastián, Spain
| | - Laurent Limot
- Université de Strasbourg , CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, France
| |
Collapse
|
40
|
Yang X, Wang H, Hand M, Sawhney K, Kaulich B, Kozhevnikov IV, Huang Q, Wang Z. Design of a multilayer-based collimated plane-grating monochromator for tender X-ray range. JOURNAL OF SYNCHROTRON RADIATION 2017; 24:168-174. [PMID: 28009556 PMCID: PMC5182023 DOI: 10.1107/s1600577516017884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Accepted: 11/08/2016] [Indexed: 06/06/2023]
Abstract
Collimated plane-grating monochromators (cPGMs), consisting of a plane mirror and plane diffraction grating, are essential optics in synchrotron radiation sources for their remarkable flexibility and good optical characteristics in the soft X-ray region. However, the poor energy transport efficiency of a conventional cPGM (single-layer-coated) degrades the source intensity and leaves reduced flux at the sample, especially for the tender X-ray range (1-4 keV) that covers a large number of K- and L-edges of medium-Z elements, and M-edges of high-Z elements. To overcome this limitation, the use of a multilayer-based cPGM is proposed, combining a multilayer-coated plane mirror with blazed multilayer gratings. With this combination, the effective efficiency of cPGMs can be increased by an order of magnitude compared with the conventional single-layer cPGMs. In addition, higher resolving power can be achieved with improved efficiency by increasing the blaze angle and working at higher diffraction order.
Collapse
Affiliation(s)
- Xiaowei Yang
- MOE Key Laboratory of Advanced Micro-Structured Materials, Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai 200092, People’s Republic of China
- Diamond Light Source Ltd, Harwell Science and Inovation Campus, Didcot OX11 0DE, UK
| | - Hongchang Wang
- Diamond Light Source Ltd, Harwell Science and Inovation Campus, Didcot OX11 0DE, UK
| | - Matthew Hand
- Diamond Light Source Ltd, Harwell Science and Inovation Campus, Didcot OX11 0DE, UK
| | - Kawal Sawhney
- Diamond Light Source Ltd, Harwell Science and Inovation Campus, Didcot OX11 0DE, UK
| | - Burkhard Kaulich
- Diamond Light Source Ltd, Harwell Science and Inovation Campus, Didcot OX11 0DE, UK
| | - Igor V. Kozhevnikov
- Shubnikov Institute of Crystallography of Federal Scientific Research Centre ‘Crystallography and Photonics’ of Russian Academy of Sciences, Moscow 119333, Russian Federation
| | - Qiushi Huang
- MOE Key Laboratory of Advanced Micro-Structured Materials, Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai 200092, People’s Republic of China
| | - Zhanshan Wang
- MOE Key Laboratory of Advanced Micro-Structured Materials, Institute of Precision Optical Engineering, School of Physics Science and Engineering, Tongji University, Shanghai 200092, People’s Republic of China
| |
Collapse
|
41
|
Campbell VE, Tonelli M, Cimatti I, Moussy JB, Tortech L, Dappe YJ, Rivière E, Guillot R, Delprat S, Mattana R, Seneor P, Ohresser P, Choueikani F, Otero E, Koprowiak F, Chilkuri VG, Suaud N, Guihéry N, Galtayries A, Miserque F, Arrio MA, Sainctavit P, Mallah T. Engineering the magnetic coupling and anisotropy at the molecule-magnetic surface interface in molecular spintronic devices. Nat Commun 2016; 7:13646. [PMID: 27929089 PMCID: PMC5476799 DOI: 10.1038/ncomms13646] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2016] [Accepted: 10/14/2016] [Indexed: 11/26/2022] Open
Abstract
A challenge in molecular spintronics is to control the magnetic coupling between magnetic molecules and magnetic electrodes to build efficient devices. Here we show that the nature of the magnetic ion of anchored metal complexes highly impacts the exchange coupling of the molecules with magnetic substrates. Surface anchoring alters the magnetic anisotropy of the cobalt(II)-containing complex (Co(Pyipa)2), and results in blocking of its magnetization due to the presence of a magnetic hysteresis loop. In contrast, no hysteresis loop is observed in the isostructural nickel(II)-containing complex (Ni(Pyipa)2). Through XMCD experiments and theoretical calculations we find that Co(Pyipa)2 is strongly ferromagnetically coupled to the surface, while Ni(Pyipa)2 is either not coupled or weakly antiferromagnetically coupled to the substrate. These results highlight the importance of the synergistic effect that the electronic structure of a metal ion and the organic ligands has on the exchange interaction and anisotropy occurring at the molecule–electrode interface.
Controlling the magnetic response of a molecular device is important for spintronic applications. Here the authors report the self-assembly, magnetic coupling, and anisotropy of two transition metal complexes bound to a ferrimagnetic surface, and probe the role of the nature of the transition metal ion.
Collapse
Affiliation(s)
- Victoria E Campbell
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay, France
| | - Monica Tonelli
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay, France
| | - Irene Cimatti
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay, France
| | - Jean-Baptiste Moussy
- SPEC, CEA, CNRS, Univesité Paris Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France
| | - Ludovic Tortech
- IPCM, UMR CNRS 7201, UPMC, Université Pierre et Marie Curie, F-75005 Paris, France
| | - Yannick J Dappe
- SPEC, CEA, CNRS, Univesité Paris Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France
| | - Eric Rivière
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay, France
| | - Régis Guillot
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay, France
| | - Sophie Delprat
- Unité Mixte de Physique CNRS/Thales, 1 Avenue Auguste Fresnel, 91767 Palaiseau, France and Université Paris-Sud, 91405 Orsay, France
| | - Richard Mattana
- Unité Mixte de Physique CNRS/Thales, 1 Avenue Auguste Fresnel, 91767 Palaiseau, France and Université Paris-Sud, 91405 Orsay, France
| | - Pierre Seneor
- Unité Mixte de Physique CNRS/Thales, 1 Avenue Auguste Fresnel, 91767 Palaiseau, France and Université Paris-Sud, 91405 Orsay, France
| | - Philippe Ohresser
- Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin-BP 48, 91192 Gif-sur-Yvette, France
| | - Fadi Choueikani
- Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin-BP 48, 91192 Gif-sur-Yvette, France
| | - Edwige Otero
- Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin-BP 48, 91192 Gif-sur-Yvette, France
| | - Florian Koprowiak
- Laboratoire de Chimie et Physique Quantiques, Université de Toulouse III, 118, route de Narbonne, 31062 Toulouse, France
| | - Vijay Gopal Chilkuri
- Laboratoire de Chimie et Physique Quantiques, Université de Toulouse III, 118, route de Narbonne, 31062 Toulouse, France
| | - Nicolas Suaud
- Laboratoire de Chimie et Physique Quantiques, Université de Toulouse III, 118, route de Narbonne, 31062 Toulouse, France
| | - Nathalie Guihéry
- Laboratoire de Chimie et Physique Quantiques, Université de Toulouse III, 118, route de Narbonne, 31062 Toulouse, France
| | - Anouk Galtayries
- PSL Research University, Chimie ParisTech-CNRS, Institut de Recherche de Chimie Paris, F-75005 Paris, France
| | - Frederic Miserque
- CEA/DEN/DANS/DPC/SCCME, Laboratoire d'Etude de la Corrosion Aqueuse, F-91191 Gif-sur-Yvette, France
| | - Marie-Anne Arrio
- IMPMC-CNRS, Université Pierre et Marie Curie, F-75005 Paris, France
| | - Philippe Sainctavit
- Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin-BP 48, 91192 Gif-sur-Yvette, France.,IMPMC-CNRS, Université Pierre et Marie Curie, F-75005 Paris, France
| | - Talal Mallah
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay, France
| |
Collapse
|
42
|
Barla A, Nicolás J, Cocco D, Valvidares SM, Herrero-Martín J, Gargiani P, Moldes J, Ruget C, Pellegrin E, Ferrer S. Design and performance of BOREAS, the beamline for resonant X-ray absorption and scattering experiments at the ALBA synchrotron light source. JOURNAL OF SYNCHROTRON RADIATION 2016; 23:1507-1517. [PMID: 27787258 DOI: 10.1107/s1600577516013461] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2016] [Accepted: 08/22/2016] [Indexed: 05/26/2023]
Abstract
The optical design of the BOREAS beamline operating at the ALBA synchrotron radiation facility is described. BOREAS is dedicated to resonant X-ray absorption and scattering experiments using soft X-rays, in an unusually extended photon energy range from 80 to above 4000 eV, and with full polarization control. Its optical scheme includes a fixed-included-angle, variable-line-spacing grating monochromator and a pair of refocusing mirrors, equipped with benders, in a Kirkpatrick-Baez arrangement. It is equipped with two end-stations, one for X-ray magnetic circular dichroism and the other for resonant magnetic scattering. The commissioning results show that the expected beamline performance is achieved both in terms of energy resolution and of photon flux at the sample position.
Collapse
Affiliation(s)
- Alessandro Barla
- ALBA Synchrotron Light Source, E-08290 Cerdanyola del Vallès, Barcelona, Spain
| | - Josep Nicolás
- ALBA Synchrotron Light Source, E-08290 Cerdanyola del Vallès, Barcelona, Spain
| | - Daniele Cocco
- SLAC National Accelerator Laboratory, 94025 Menlo Park, USA
| | | | | | - Pierluigi Gargiani
- ALBA Synchrotron Light Source, E-08290 Cerdanyola del Vallès, Barcelona, Spain
| | - Jairo Moldes
- ALBA Synchrotron Light Source, E-08290 Cerdanyola del Vallès, Barcelona, Spain
| | - Claude Ruget
- ALBA Synchrotron Light Source, E-08290 Cerdanyola del Vallès, Barcelona, Spain
| | - Eric Pellegrin
- ALBA Synchrotron Light Source, E-08290 Cerdanyola del Vallès, Barcelona, Spain
| | - Salvador Ferrer
- ALBA Synchrotron Light Source, E-08290 Cerdanyola del Vallès, Barcelona, Spain
| |
Collapse
|
43
|
Abstract
The strong coupling between antiferromagnetism and ferroelectricity at room temperature found in BiFeO3 generates high expectations for the design and development of technological devices with novel functionalities. However, the multi-domain nature of the material tends to nullify the properties of interest and complicates the thorough understanding of the mechanisms that are responsible for those properties. Here we report the realization of a BiFeO3 material in thin film form with single-domain behaviour in both its magnetism and ferroelectricity: the entire film shows its antiferromagnetic axis aligned along the crystallographic b axis and its ferroelectric polarization along the c axis. With this we are able to reveal that the canted ferromagnetic moment due to the Dzyaloshinskii–Moriya interaction is parallel to the a axis. Furthermore, by fabricating a Co/BiFeO3 heterostructure, we demonstrate that the ferromagnetic moment of the Co film does couple directly to the canted moment of BiFeO3. The coupling of ferroelectric and antiferromagnetic order in BiFeO3 makes it appealing for applications however the presence of domain structure acts to undermine this potential. Here, the authors demonstrate BiFeO3 thin films with a single domain of electrical polarization and canted antiferromagnetic order.
Collapse
|
44
|
Jafri SF, Koumousi ES, Sainctavit P, Juhin A, Schuler V, Bun U O, Mitcov D, Dechambenoit P, Mathonière C, Clérac R, Otero E, Ohresser P, Cartier Dit Moulin C, Arrio MA. Large Orbital Magnetic Moment Measured in the [TpFe(III)(CN)3](-) Precursor of Photomagnetic Molecular Prussian Blue Analogues. Inorg Chem 2016; 55:6980-7. [PMID: 27385292 DOI: 10.1021/acs.inorgchem.6b00664] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Photomagnetism in three-dimensional Co/Fe Prussian blue analogues is a complex phenomenon, whose detailed mechanism is not yet fully understood. Recently, researchers have been able to prepare molecular fragments of these networks using a building block synthetic approach from mononuclear precursors. The main objective in this strategy is to isolate the smallest units that show an intramolecular electron transfer to have a better understanding of the electronic processes. A prior requirement to the development of this kind of system is to understand to what extent electronic and magnetic properties are inherited from the corresponding precursors. In this work, we investigate the electronic and magnetic properties of the FeTp precursor (N(C4H9)4)[TpFe(III)(CN)3], (Tp being tris-pyrazolyl borate) of a recently reported binuclear cyanido-bridged Fe/Co complex. X-ray absorption spectroscopy and X-ray magnetic circular dichroism measurements at the Fe L2,3 edges (2p → 3d) supported by ligand field multiplet calculations have allowed to determine the spin and orbit magnetic moments. Inaccuracy of the spin sum rule in the case of low-spin Fe(III) ion was demonstrated. An exceptionally large value of the orbital magnetic moment is found (0.9 μB at T = 2 K and B = 6.5 T) that is likely to play an important role in the magnetic and photomagnetic properties of molecular Fe/Co Prussian blue analogues.
Collapse
Affiliation(s)
- Sadaf Fatima Jafri
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, CNRS, UPMC, IRD, MNHN , 75252 Paris Cedex 05, France
| | - Evangelia S Koumousi
- CNRS, ICMCB, UPR 9048 , F-33600 Pessac, France.,Univ. Bordeaux, ICMCB, UPR 9048 , F-33600 Pessac, France.,CNRS, CRPP, UPR 8641 , F-33600 Pessac, France.,Univ. Bordeaux, CRPP, UPR 8641 , F-33600 Pessac, France
| | - Philippe Sainctavit
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, CNRS, UPMC, IRD, MNHN , 75252 Paris Cedex 05, France.,Synchrotron SOLEIL , L'Orme des Merisiers, 91190 Saint-Aubin, France
| | - Amélie Juhin
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, CNRS, UPMC, IRD, MNHN , 75252 Paris Cedex 05, France
| | - Vivien Schuler
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, CNRS, UPMC, IRD, MNHN , 75252 Paris Cedex 05, France
| | - Oana Bun U
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, CNRS, UPMC, IRD, MNHN , 75252 Paris Cedex 05, France
| | - Dmitri Mitcov
- CNRS, CRPP, UPR 8641 , F-33600 Pessac, France.,Univ. Bordeaux, CRPP, UPR 8641 , F-33600 Pessac, France
| | - Pierre Dechambenoit
- CNRS, CRPP, UPR 8641 , F-33600 Pessac, France.,Univ. Bordeaux, CRPP, UPR 8641 , F-33600 Pessac, France
| | - Corine Mathonière
- CNRS, ICMCB, UPR 9048 , F-33600 Pessac, France.,Univ. Bordeaux, ICMCB, UPR 9048 , F-33600 Pessac, France
| | - Rodolphe Clérac
- CNRS, CRPP, UPR 8641 , F-33600 Pessac, France.,Univ. Bordeaux, CRPP, UPR 8641 , F-33600 Pessac, France
| | - Edwige Otero
- Synchrotron SOLEIL , L'Orme des Merisiers, 91190 Saint-Aubin, France
| | - Philippe Ohresser
- Synchrotron SOLEIL , L'Orme des Merisiers, 91190 Saint-Aubin, France
| | - Christophe Cartier Dit Moulin
- CNRS, UMR 8232, Institut Parisien de Chimie Moléculaire , F-75005 Paris, France.,Sorbonne Universités, UPMC Univ. Paris 06, UMR 8232, IPCM , F-75005 Paris, France
| | - Marie-Anne Arrio
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR7590, CNRS, UPMC, IRD, MNHN , 75252 Paris Cedex 05, France
| |
Collapse
|
45
|
Senf F, Bijkerk F, Eggenstein F, Gwalt G, Huang Q, Kruijs R, Kutz O, Lemke S, Louis E, Mertin M, Packe I, Rudolph I, Schäfers F, Siewert F, Sokolov A, Sturm JM, Waberski C, Wang Z, Wolf J, Zeschke T, Erko A. Highly efficient blazed grating with multilayer coating for tender X-ray energies. OPTICS EXPRESS 2016; 24:13220-13230. [PMID: 27410339 DOI: 10.1364/oe.24.013220] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
For photon energies of 1 - 5 keV, blazed gratings with multilayer coating are ideally suited for the suppression of stray and higher orders light in grating monochromators. We developed and characterized a blazed 2000 lines/mm grating coated with a 20 period Cr/C- multilayer. The multilayer d-spacing of 7.3 nm has been adapted to the line distance of 500 nm and the blaze angle of 0.84° in order to provide highest efficiency in the photon energy range between 1.5 keV and 3 keV. Efficiency of the multilayer grating as well as the reflectance of a witness multilayer which were coated simultaneously have been measured. An efficiency of 35% was measured at 2 keV while a maximum efficiency of 55% was achieved at 4 keV. In addition, a strong suppression of higher orders was observed which makes blazed multilayer gratings a favorable dispersing element also for the low X-ray energy range.
Collapse
|
46
|
Joly L, Muller B, Sternitzky E, Faullumel JG, Boulard A, Otero E, Choueikani F, Kappler JP, Studniarek M, Bowen M, Ohresser P. Versatile variable temperature insert at the DEIMOS beamline for in situ electrical transport measurements. JOURNAL OF SYNCHROTRON RADIATION 2016; 23:652-657. [PMID: 27140143 DOI: 10.1107/s1600577516002551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Accepted: 02/11/2016] [Indexed: 06/05/2023]
Abstract
The design and the first experiments are described of a versatile cryogenic insert used for its electrical transport capabilities. The insert is designed for the cryomagnet installed on the DEIMOS beamline at the SOLEIL synchrotron dedicated to magnetic characterizations through X-ray absorption spectroscopy (XAS) measurements. This development was spurred by the multifunctional properties of novel materials such as multiferroics, in which, for example, the magnetic and electrical orders are intertwined and may be probed using XAS. The insert thus enables XAS to in situ probe this interplay. The implementation of redundant wiring and careful shielding also enables studies on operating electronic devices. Measurements on magnetic tunnel junctions illustrate the potential of the equipment toward XAS studies of in operando electronic devices.
Collapse
Affiliation(s)
- L Joly
- Institut de Physique et de Chimie des Materiaux de Strasbourg, Université de Strasbourg, UMR 7504, 23 Rue du Loess, BP 43, 67034 Strasbourg Cedex 2, France
| | - B Muller
- Institut de Physique et de Chimie des Materiaux de Strasbourg, Université de Strasbourg, UMR 7504, 23 Rue du Loess, BP 43, 67034 Strasbourg Cedex 2, France
| | - E Sternitzky
- Institut de Physique et de Chimie des Materiaux de Strasbourg, Université de Strasbourg, UMR 7504, 23 Rue du Loess, BP 43, 67034 Strasbourg Cedex 2, France
| | - J G Faullumel
- Institut de Physique et de Chimie des Materiaux de Strasbourg, Université de Strasbourg, UMR 7504, 23 Rue du Loess, BP 43, 67034 Strasbourg Cedex 2, France
| | - A Boulard
- Institut de Physique et de Chimie des Materiaux de Strasbourg, Université de Strasbourg, UMR 7504, 23 Rue du Loess, BP 43, 67034 Strasbourg Cedex 2, France
| | - E Otero
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France
| | - F Choueikani
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France
| | - J P Kappler
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France
| | - M Studniarek
- Institut de Physique et de Chimie des Materiaux de Strasbourg, Université de Strasbourg, UMR 7504, 23 Rue du Loess, BP 43, 67034 Strasbourg Cedex 2, France
| | - M Bowen
- Institut de Physique et de Chimie des Materiaux de Strasbourg, Université de Strasbourg, UMR 7504, 23 Rue du Loess, BP 43, 67034 Strasbourg Cedex 2, France
| | - P Ohresser
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France
| |
Collapse
|
47
|
Vlašín O, Jarrier R, Arras R, Calmels L, Warot-Fonrose B, Marcelot C, Jamet M, Ohresser P, Scheurer F, Hertel R, Herranz G, Cherifi-Hertel S. Interface Magnetoelectric Coupling in Co/Pb(Zr,Ti)O3. ACS APPLIED MATERIALS & INTERFACES 2016; 8:7553-7563. [PMID: 26939641 DOI: 10.1021/acsami.5b12777] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Magnetoelectric coupling at multiferroic interfaces is a promising route toward the nonvolatile electric-field control of magnetization. Here, we use optical measurements to study the static and dynamic variations of the interface magnetization induced by an electric field in Co/PbZr0.2Ti0.8O3 (Co/PZT) bilayers at room temperature. The measurements allow us to identify different coupling mechanisms. We further investigate the local electronic and magnetic structure of the interface by means of transmission electron microscopy, soft X-ray magnetic circular dichroism, and density functional theory to corroborate the coupling mechanism. The measurements demonstrate a mixed linear and quadratic optical response to the electric field, which results from a magneto-electro-optical effect. We propose a decomposition method of the optical signal to discriminate between different components involved in the electric field-induced polarization rotation of the reflected light. This allows us to extract a signal that we can ascribe to interface magnetoelectric coupling. The associated surface magnetization exhibits a clear hysteretic variation of odd symmetry with respect to the electric field and nonzero remanence. The interface coupling is remarkably stable over a wide frequency range (1-50 kHz), and the application of a bias magnetic field is not necessary for the coupling to occur. These results show the potential of exploiting interface coupling with the prospect of optimizing the performance of magnetoelectric memory devices in terms of stability, as well as fast and dissipationless operation.
Collapse
Affiliation(s)
- Ondřej Vlašín
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, CNRS, and Université de Strasbourg , 23 rue du Loess, F-67300 Strasbourg, France
| | - Romain Jarrier
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, CNRS, and Université de Strasbourg , 23 rue du Loess, F-67300 Strasbourg, France
| | - Rémi Arras
- CEMES, Université de Toulouse, CNRS, UPS , 29 rue Jeanne-Marvig, F-31055 Toulouse, France
| | - Lionel Calmels
- CEMES, Université de Toulouse, CNRS, UPS , 29 rue Jeanne-Marvig, F-31055 Toulouse, France
| | | | - Cécile Marcelot
- CEMES, Université de Toulouse, CNRS, UPS , 29 rue Jeanne-Marvig, F-31055 Toulouse, France
| | - Matthieu Jamet
- SP2M, Université Grenoble Alpes, INAC, and CEA , F-38000 Grenoble, France
| | - Philippe Ohresser
- Synchrotron SOLEIL , L'Orme des Merisiers, Saint-Aubin, Gif-sur-Yvette F-91192, France
| | - Fabrice Scheurer
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, CNRS, and Université de Strasbourg , 23 rue du Loess, F-67300 Strasbourg, France
| | - Riccardo Hertel
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, CNRS, and Université de Strasbourg , 23 rue du Loess, F-67300 Strasbourg, France
- Physikalisches Institut, Karlsruhe Institute of Technology , Wolfgang-Gaede-Str. 1, 76131 Karlsruhe, Germany
| | - Gervasi Herranz
- Institut de Ciència de Materials de Barcelona, ICMAB-CSIC , Campus de la UAB, Bellaterra 08193, Catalonia, Spain
| | - Salia Cherifi-Hertel
- Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, CNRS, and Université de Strasbourg , 23 rue du Loess, F-67300 Strasbourg, France
| |
Collapse
|
48
|
Observation of an atomic exchange bias effect in DyCo4 film. Sci Rep 2015; 5:18377. [PMID: 26675537 PMCID: PMC4682085 DOI: 10.1038/srep18377] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Accepted: 11/03/2015] [Indexed: 11/30/2022] Open
Abstract
The fundamental important and technologically widely employed exchange bias effect occurs in general in bilayers of magnetic thin films consisting of antiferromagnetic and ferromagnetic layers where the hard magnetization behavior of an antiferromagnetic thin film causes a shift in the magnetization curve of a soft ferromagnetic film. The minimization of the single magnetic grain size to increase the storage density and the subsequent demand for magnetic materials with very high magnetic anisotropy requires a system with high HEB. Here we report an extremely high HEB of 4 Tesla observed in a single amorphous DyCo4 film close to room temperature. The origin of the exchange bias can be associated with the variation of the magnetic behavior from the surface towards the bulk part of the film revealed by X-ray absorption spectroscopy and X-ray magnetic circular dichroism techniques utilizing the bulk sensitive transmission and the surface sensitive total electron yield modes. The competition between the atomic exchange coupling in the single film and the Zeeman interaction lead to an intrinsic exchanged coupled system and the so far highest exchange bias effect HEB = 4 Tesla reported in a single film, which is accommodated by a partial domain wall formation.
Collapse
|
49
|
Gruber M, Ibrahim F, Boukari S, Joly L, Da Costa V, Studniarek M, Peter M, Isshiki H, Jabbar H, Davesne V, Arabski J, Otero E, Choueikani F, Chen K, Ohresser P, Wulfhekel W, Scheurer F, Beaurepaire E, Alouani M, Weber W, Bowen M. Spin-Dependent Hybridization between Molecule and Metal at Room Temperature through Interlayer Exchange Coupling. NANO LETTERS 2015; 15:7921-7926. [PMID: 26575946 DOI: 10.1021/acs.nanolett.5b02961] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We experimentally and theoretically show that the magnetic coupling at room temperature between paramagnetic Mn within manganese phthalocyanine molecules and a Co layer persists when separated by a Cu spacer. The molecule's magnetization amplitude and direction can be tuned by varying the Cu-spacer thickness and evolves according to an interlayer exchange coupling mechanism. Ab initio calculations predict a highly spin-polarized density of states at the Fermi level of this metal-molecule interface, thereby strengthening prospective spintronics applications.
Collapse
Affiliation(s)
- Manuel Gruber
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504 , 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France
- Physikalisches Institut, Karlsruhe Institute of Technology , Wolfgang-Gaede-Strasse 1, 76131 Karlsruhe, Germany
| | - Fatima Ibrahim
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504 , 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France
| | - Samy Boukari
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504 , 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France
| | - Loïc Joly
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504 , 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France
| | - Victor Da Costa
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504 , 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France
| | - Michał Studniarek
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504 , 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France
- Synchrotron SOLEIL , L'Orme des Merisiers Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France
| | - Moritz Peter
- Physikalisches Institut, Karlsruhe Institute of Technology , Wolfgang-Gaede-Strasse 1, 76131 Karlsruhe, Germany
| | - Hironari Isshiki
- Physikalisches Institut, Karlsruhe Institute of Technology , Wolfgang-Gaede-Strasse 1, 76131 Karlsruhe, Germany
| | - Hashim Jabbar
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504 , 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France
| | - Vincent Davesne
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504 , 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France
- Physikalisches Institut, Karlsruhe Institute of Technology , Wolfgang-Gaede-Strasse 1, 76131 Karlsruhe, Germany
| | - Jacek Arabski
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504 , 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France
| | - Edwige Otero
- Synchrotron SOLEIL , L'Orme des Merisiers Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France
| | - Fadi Choueikani
- Synchrotron SOLEIL , L'Orme des Merisiers Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France
| | - Kai Chen
- Synchrotron SOLEIL , L'Orme des Merisiers Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France
| | - Philippe Ohresser
- Synchrotron SOLEIL , L'Orme des Merisiers Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France
| | - Wulf Wulfhekel
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504 , 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France
- Institute of Nanotechnology, Karlsruhe Institute of Technology , 76021 Karlsruhe, Germany
| | - Fabrice Scheurer
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504 , 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France
| | - Eric Beaurepaire
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504 , 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France
| | - Mebarek Alouani
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504 , 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France
| | - Wolfgang Weber
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504 , 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France
| | - Martin Bowen
- Institut de Physique et Chimie des Matériaux de Strasbourg, Université de Strasbourg, CNRS UMR 7504 , 23 rue du Loess, BP 43, F-67034 Strasbourg Cedex 2, France
| |
Collapse
|
50
|
Prado Y, Daffé N, Michel A, Georgelin T, Yaacoub N, Grenèche JM, Choueikani F, Otero E, Ohresser P, Arrio MA, Cartier-dit-Moulin C, Sainctavit P, Fleury B, Dupuis V, Lisnard L, Fresnais J. Enhancing the magnetic anisotropy of maghemite nanoparticles via the surface coordination of molecular complexes. Nat Commun 2015; 6:10139. [PMID: 26634987 PMCID: PMC4686836 DOI: 10.1038/ncomms10139] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Accepted: 11/08/2015] [Indexed: 12/16/2022] Open
Abstract
Superparamagnetic nanoparticles are promising objects for data storage or medical applications. In the smallest--and more attractive--systems, the properties are governed by the magnetic anisotropy. Here we report a molecule-based synthetic strategy to enhance this anisotropy in sub-10-nm nanoparticles. It consists of the fabrication of composite materials where anisotropic molecular complexes are coordinated to the surface of the nanoparticles. Reacting 5 nm γ-Fe2O3 nanoparticles with the [Co(II)(TPMA)Cl2] complex (TPMA: tris(2-pyridylmethyl)amine) leads to the desired composite materials and the characterization of the functionalized nanoparticles evidences the successful coordination--without nanoparticle aggregation and without complex dissociation--of the molecular complexes to the nanoparticles surface. Magnetic measurements indicate the significant enhancement of the anisotropy in the final objects. Indeed, the functionalized nanoparticles show a threefold increase of the blocking temperature and a coercive field increased by one order of magnitude.
Collapse
Affiliation(s)
- Yoann Prado
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8234, PHENIX, CNRS, F-75005 Paris, France
| | - Niéli Daffé
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8234, PHENIX, CNRS, F-75005 Paris, France
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR 7590, CNRS, UPMC, IRD, MNHN, F-75005 Paris, France
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin—BP 48, 91192 Gif-sur-Yvette, France
| | - Aude Michel
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8234, PHENIX, CNRS, F-75005 Paris, France
| | - Thomas Georgelin
- Sorbonne Universités, UPMC Univ Paris 06, UMR 7197, LRS, F-94200 Ivry-sur-Seine, France
- CNRS, UMR 7197, Laboratoire de Réactivité de Surface, F-94200 Ivry-sur-Seine, France
| | - Nader Yaacoub
- Institut des Molécules et Matériaux du Mans CNRS UMR-6283, Université du Maine, F-72085 Le Mans, France
| | - Jean-Marc Grenèche
- Institut des Molécules et Matériaux du Mans CNRS UMR-6283, Université du Maine, F-72085 Le Mans, France
| | - Fadi Choueikani
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin—BP 48, 91192 Gif-sur-Yvette, France
| | - Edwige Otero
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin—BP 48, 91192 Gif-sur-Yvette, France
| | - Philippe Ohresser
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin—BP 48, 91192 Gif-sur-Yvette, France
| | - Marie-Anne Arrio
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR 7590, CNRS, UPMC, IRD, MNHN, F-75005 Paris, France
| | - Christophe Cartier-dit-Moulin
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8232, IPCM, F-75005 Paris, France
- CNRS, UMR 8232, Institut Parisien de Chimie Moléculaire, F-75005 Paris, France
| | - Philippe Sainctavit
- Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR 7590, CNRS, UPMC, IRD, MNHN, F-75005 Paris, France
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin—BP 48, 91192 Gif-sur-Yvette, France
| | - Benoit Fleury
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8232, IPCM, F-75005 Paris, France
- CNRS, UMR 8232, Institut Parisien de Chimie Moléculaire, F-75005 Paris, France
| | - Vincent Dupuis
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8234, PHENIX, CNRS, F-75005 Paris, France
| | - Laurent Lisnard
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8232, IPCM, F-75005 Paris, France
- CNRS, UMR 8232, Institut Parisien de Chimie Moléculaire, F-75005 Paris, France
| | - Jérôme Fresnais
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8234, PHENIX, CNRS, F-75005 Paris, France
| |
Collapse
|