1
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Metzelaars M, Schleicher S, Hattori T, Borca B, Matthes F, Sanz S, Bürgler DE, Rawson J, Schneider CM, Kögerler P. Cyclophane with eclipsed pyrene units enables construction of spin interfaces with chemical accuracy. Chem Sci 2021; 12:8430-8437. [PMID: 34221324 PMCID: PMC8221062 DOI: 10.1039/d1sc01036k] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Advanced functionality in molecular electronics and spintronics is orchestrated by exact molecular arrangements at metal surfaces, but the strategies for constructing such arrangements remain limited. Here, we report the synthesis and surface hybridization of a cyclophane that comprises two pyrene groups fastened together by two ferrocene pillars. Crystallographic structure analysis revealed pyrene planes separated by ∼352 pm and stacked in an eclipsed geometry that approximates the rare configuration of AA-stacked bilayer graphene. We deposited this cyclophane onto surfaces of Cu(111) and Co(111) at submonolayer coverage and studied the resulting hybrid entities with scanning tunnelling microscopy (STM). We found distinct characteristics of this cyclophane on each metal surface: on non-magnetic Cu(111), physisorption occurred and the two pyrene groups remained electronically coupled to each other; on ferromagnetic Co(111) nanoislands, chemisorption occurred and the two pyrene groups became electronically decoupled. Spin-polarized STM measurements revealed that the ferrocene groups had spin polarization opposite to that of the surrounding Co metal, while the pyrene stack had no spin polarization. Comparisons to the non-stacked analogue comprising only one pyrene group bolster our interpretation of the cyclophane's STM features. The design strategy presented herein can be extended to realize versatile, three-dimensional platforms in single-molecule electronics and spintronics. A chemical strategy for the bottom-up construction of 3D spin interfaces is presented. Scanning tunnelling microscopy reveals distinct electronic features of a cyclophane with precisely designed pi-stacking on ferromagnetic Co(111) nanoislands.![]()
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Affiliation(s)
- Marvin Metzelaars
- Institute of Inorganic Chemistry, RWTH Aachen University 52074 Aachen Germany
| | | | - Takuma Hattori
- Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich 52428 Jülich Germany
| | - Bogdana Borca
- Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich 52428 Jülich Germany .,National Institute of Materials Physics Atomistilor 405A, Magurele 077125 Ilfov Romania
| | - Frank Matthes
- Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich 52428 Jülich Germany
| | - Sergio Sanz
- Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich 52428 Jülich Germany
| | - Daniel E Bürgler
- Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich 52428 Jülich Germany
| | - Jeff Rawson
- Institute of Inorganic Chemistry, RWTH Aachen University 52074 Aachen Germany.,Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich 52428 Jülich Germany
| | - Claus M Schneider
- Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich 52428 Jülich Germany
| | - Paul Kögerler
- Institute of Inorganic Chemistry, RWTH Aachen University 52074 Aachen Germany.,Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich 52428 Jülich Germany
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2
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Homberg J, Weismann A, Berndt R, Gruber M. Inducing and Controlling Molecular Magnetism through Supramolecular Manipulation. ACS NANO 2020; 14:17387-17395. [PMID: 33225694 DOI: 10.1021/acsnano.0c07574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Diamagnetic H2 phthalocyanine molecules are probed on superconducting Pb(100) using a low-temperature scanning tunneling micoscope (STM). In supramolecular arrays made with the STM, the molecules acquire a spin as detected via the emergence of Yu-Shiba-Rusinov resonances. The spin moments vary among the molecules and are determined by the electrostatic field that results from polar bonds in the surrounding Pc molecules. The moments are further finely tuned by repositioning the hydrogen atoms of the inner macrocycle of the surrounding molecules.
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Affiliation(s)
- Jan Homberg
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität, 24098 Kiel, Germany
| | - Alexander Weismann
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität, 24098 Kiel, Germany
| | - Richard Berndt
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität, 24098 Kiel, Germany
| | - Manuel Gruber
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität, 24098 Kiel, Germany
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3
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Garnier L, Verlhac B, Abufager P, Lorente N, Ormaza M, Limot L. The Kondo Effect of a Molecular Tip As a Magnetic Sensor. NANO LETTERS 2020; 20:8193-8199. [PMID: 33119321 DOI: 10.1021/acs.nanolett.0c03271] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A single molecule offers to tailor and control the probing capability of a scanning tunneling microscope when placed on the tip. With the help of first-principles calculations, we show that on-tip spin sensitivity is possible through the Kondo ground state of a spin S = 1/2 cobaltocene molecule. When attached to the tip apex, we observe a reproducible Kondo resonance, which splits apart upon tuning the exchange coupling of cobaltocene to an iron atom on the surface. The spin-split Kondo resonance provides quantitative information on the exchange field and on the spin polarization of the iron atom. We also demonstrate that molecular vibrations cause the emergence of Kondo side peaks, which, unlike the Kondo resonance, are sensitive to cobaltocene adsorption.
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Affiliation(s)
- Léo Garnier
- Université de Strasbourg, CNRS, IPCMS, UMR 7504, Strasbourg F-67000, France
| | - Benjamin Verlhac
- Université de Strasbourg, CNRS, IPCMS, UMR 7504, Strasbourg F-67000, France
| | - Paula Abufager
- Instituto de Física de Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and Universidad Nacional de Rosario, Avenida Pellegrini 250 (2000), Rosario 2000, Argentina
| | - Nicolás Lorente
- Centro de Física de Materiales (CFM), Donostia-San San Sebastián20018, Spain
- Donostia International Physics Center (DIPC), Donostia-San Sebastián20018, Spain
| | - Maider Ormaza
- Université de Strasbourg, CNRS, IPCMS, UMR 7504, Strasbourg F-67000, France
| | - Laurent Limot
- Université de Strasbourg, CNRS, IPCMS, UMR 7504, Strasbourg F-67000, France
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4
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Bachellier N, Verlhac B, Garnier L, Zaldívar J, Rubio-Verdú C, Abufager P, Ormaza M, Choi DJ, Bocquet ML, Pascual JI, Lorente N, Limot L. Vibron-assisted spin excitation in a magnetically anisotropic molecule. Nat Commun 2020; 11:1619. [PMID: 32238814 PMCID: PMC7113279 DOI: 10.1038/s41467-020-15266-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 02/21/2020] [Indexed: 11/09/2022] Open
Abstract
The electrical control and readout of molecular spin states are key for high-density storage. Expectations are that electrically-driven spin and vibrational excitations in a molecule should give rise to new conductance features in the presence of magnetic anisotropy, offering alternative routes to study and, ultimately, manipulate molecular magnetism. Here, we use inelastic electron tunneling spectroscopy to promote and detect the excited spin states of a prototypical molecule with magnetic anisotropy. We demonstrate the existence of a vibron-assisted spin excitation that can exceed in energy and in amplitude a simple excitation among spin states. This excitation, which can be quenched by structural changes in the magnetic molecule, is explained using first-principles calculations that include dynamical electronic correlations.
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Affiliation(s)
- N Bachellier
- Université de Strasbourg, CNRS, IPCMS, UMR 7504, F-67000, Strasbourg, France
| | - B Verlhac
- Université de Strasbourg, CNRS, IPCMS, UMR 7504, F-67000, Strasbourg, France.
| | - L Garnier
- Université de Strasbourg, CNRS, IPCMS, UMR 7504, F-67000, Strasbourg, France
| | - J Zaldívar
- CIC nanoGUNE, 20018, Donostia-San Sebastián, Spain
| | | | - P Abufager
- Instituto de Física de Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and Universidad Nacional de Rosario, Av. Pellegrini 250 (2000), Rosario, Argentina
| | - M Ormaza
- Université de Strasbourg, CNRS, IPCMS, UMR 7504, F-67000, Strasbourg, France
- Universidad del País Vasco, Dpto. Física Aplicada I, 20018, Donostia-San Sebastián, Spain
| | - D-J Choi
- Centro de Física de Materiales (CFM MPC) CSIC-EHU, 20018, Donostia-San San Sebastián, Spain
- Ikerbasque, Basque Foundation for Science, Bilbao, Spain
| | - M-L Bocquet
- PASTEUR, Département de Chimie, Ecole Normale Supérieure, PSL University, Sorbonne Universités, CNRS, 24 Rue Lhomond, 75005, Paris, France
| | - J I Pascual
- CIC nanoGUNE, 20018, Donostia-San Sebastián, Spain
- Ikerbasque, Basque Foundation for Science, Bilbao, Spain
| | - N Lorente
- Centro de Física de Materiales (CFM MPC) CSIC-EHU, 20018, Donostia-San San Sebastián, Spain
- Donostia International Physics Center (DIPC), 20018, Donostia-San Sebastián, Spain
| | - L Limot
- Université de Strasbourg, CNRS, IPCMS, UMR 7504, F-67000, Strasbourg, France.
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5
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Verlhac B, Bachellier N, Garnier L, Ormaza M, Abufager P, Robles R, Bocquet ML, Ternes M, Lorente N, Limot L. Atomic-scale spin sensing with a single molecule at the apex of a scanning tunneling microscope. Science 2019; 366:623-627. [DOI: 10.1126/science.aax8222] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Accepted: 10/08/2019] [Indexed: 11/03/2022]
Affiliation(s)
- B. Verlhac
- Université de Strasbourg, CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, France
| | - N. Bachellier
- Université de Strasbourg, CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, France
| | - L. Garnier
- Université de Strasbourg, CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, France
| | - M. Ormaza
- Université de Strasbourg, CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, France
| | - P. Abufager
- Instituto de Física de Rosario, CONICET and Universidad Nacional de Rosario, Av. Pellegrini 250 (2000) Rosario, Argentina
| | - R. Robles
- Centro de Física de Materiales CFM/MPC (CSIC-UPV/EHU), 20018 Donostia-San Sebastián, Spain
| | - M.-L. Bocquet
- PASTEUR, Département de Chimie, Ecole Normale Supérieure, PSL Research University, Sorbonne Universités, UPMC Univ. Paris 06, CNRS, 75005 Paris, France
| | - M. Ternes
- Institute of Physics II B, RWTH Aachen University, 52074 Aachen, Germany
- Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany
| | - N. Lorente
- Centro de Física de Materiales CFM/MPC (CSIC-UPV/EHU), 20018 Donostia-San Sebastián, Spain
- Donostia International Physics Center (DIPC), 20018 Donostia-San Sebastián, Spain
| | - L. Limot
- Université de Strasbourg, CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, France
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6
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Gruber M, Weismann A, Berndt R. The Kondo resonance line shape in scanning tunnelling spectroscopy: instrumental aspects. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:424001. [PMID: 30191885 DOI: 10.1088/1361-648x/aadfa3] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In the scanning tunnelling microscope, the many-body Kondo effect leads to a zero-bias feature of the differential conductance spectra of magnetic adsorbates on surfaces. The intrinsic line shape of this Kondo resonance and its temperature dependence in principle contain valuable information. We use measurements on a molecular Kondo system, all- trans retinoic acid on Au(1 1 1), and model calculations to discuss the role of instrumental broadening. The modulation voltage used for the lock-in detection, noise on the sample voltage, and the temperature of the microscope tip are considered. These sources of broadening affect the apparent line shapes and render difficult a determination of the intrinsic line width, in particular when variable temperatures are involved.
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Affiliation(s)
- Manuel Gruber
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany
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7
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Steenbock T, Herrmann C. Toward an automated analysis of exchange pathways in spin-coupled systems. J Comput Chem 2018; 39:81-92. [PMID: 29044625 DOI: 10.1002/jcc.25081] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Revised: 09/22/2017] [Accepted: 09/24/2017] [Indexed: 01/25/2023]
Abstract
Understanding (super-)exchange coupling between local spins is an important task in theoretical chemistry and solid-state physics. We show that a Green's-function approach introduced earlier (Liechtenstein et al., J. Phys. F 1984, 14, L125; Steenbock et al., J. Chem. Theory Comput. 2015, 11, 5651) can be used for analyzing exchange coupling pathways in an automated fashion rather than by visual inspection of molecular orbitals. We demonstrate the capabilities of this approach by comparing it to previously published pathway analyses for hydroxy-bridged dinuclear copper complexes and an oxo-bridged dinuclear manganese complex, and employ it for discriminating between through-space and through-bond pathways in a naphthalene-bridged bisnickelocene complex. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Torben Steenbock
- Institute of Inorganic and Applied Chemistry, Chemistry Department, University of Hamburg, Martin-Luther-King-Platz 6, Hamburg, 20146, Germany
| | - Carmen Herrmann
- Institute of Inorganic and Applied Chemistry, Chemistry Department, University of Hamburg, Martin-Luther-King-Platz 6, Hamburg, 20146, Germany
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8
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Controlled spin switching in a metallocene molecular junction. Nat Commun 2017; 8:1974. [PMID: 29215014 PMCID: PMC5719446 DOI: 10.1038/s41467-017-02151-6] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Accepted: 11/09/2017] [Indexed: 12/01/2022] Open
Abstract
The active control of a molecular spin represents one of the main challenges in molecular spintronics. Up to now spin manipulation has been achieved through the modification of the molecular structure either by chemical doping or by external stimuli. However, the spin of a molecule adsorbed on a surface depends primarily on the interaction between its localized orbitals and the electronic states of the substrate. Here we change the effective spin of a single molecule by modifying the molecule/metal interface in a controlled way using a low-temperature scanning tunneling microscope. A nickelocene molecule reversibly switches from a spin 1 to 1/2 when varying the electrode–electrode distance from tunnel to contact regime. This switching is experimentally evidenced by inelastic and elastic spin-flip mechanisms observed in reproducible conductance measurements and understood using first principle calculations. Our work demonstrates the active control over the spin state of single molecule devices through interface manipulation. Manipulating spin states of molecules in a controllable manner is essential to develop the molecule-based spintronics technologies. Here, Ormaza et al. show how to use the interaction between a single metallocene molecule and a metallic surface to reversibly switch spin from 1 to ½ in a junction.
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9
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Knaak T, Gruber M, Lindström C, Bocquet ML, Heck J, Berndt R. Ligand-Induced Energy Shift and Localization of Kondo Resonances in Cobalt-Based Complexes on Cu(111). NANO LETTERS 2017; 17:7146-7151. [PMID: 29045149 DOI: 10.1021/acs.nanolett.7b04181] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Magnetic sandwich complexes are of particular interest for molecular spintronics. Using scanning tunneling microscopy, we evidence the successful deposition of 1,3,5-tris(η6-borabenzene-η5-cyclopentadienylcobalt) benzene, a molecule composed of three connected magnetic sandwich units, on Cu(111). Scanning tunneling spectra reveal two distinct spatial-dependent narrow resonances close to the Fermi level for the trimer molecules as well as for molecular fragments composed of one and two magnetic units. With the help of density functional theory, these resonances are interpreted as two Kondo resonances originating from two distinct nondegenerate d-like orbitals. These Kondo resonances are found to have defined spatial extents dictated by the hybridization of the involved orbitals with that of the ligands. These results opens promising perspectives for investigating complex Kondo systems composed of several "Kondo" orbitals.
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Affiliation(s)
- Thomas Knaak
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel , Leibnizstrasse 19, 24098 Kiel, Germany
| | - Manuel Gruber
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel , Leibnizstrasse 19, 24098 Kiel, Germany
| | - Christoph Lindström
- Institut für Anorganische und Angewandte Chemie, Universität Hamburg , Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
| | - Marie-Laure Bocquet
- PASTEUR, Département de Chimie, École Normale Supérieure, PSL Research University, Sorbonne Universités, UPMC Université Paris 06, CNRS , 75005 Paris, France
| | - Jürgen Heck
- Institut für Anorganische und Angewandte Chemie, Universität Hamburg , Martin-Luther-King-Platz 6, 20146 Hamburg, Germany
| | - Richard Berndt
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel , Leibnizstrasse 19, 24098 Kiel, Germany
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10
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Cirera B, Matarrubia J, Kaposi T, Giménez-Agulló N, Paszkiewicz M, Klappenberger F, Otero R, Gallego JM, Ballester P, Barth JV, Miranda R, Galán-Mascarós JR, Auwärter W, Ecija D. Preservation of electronic properties of double-decker complexes on metallic supports. Phys Chem Chem Phys 2017; 19:8282-8287. [PMID: 28277577 DOI: 10.1039/c6cp08239d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Single-molecule magnets based on lanthanide double-deckers are attracting significant attention due to their unrivaled single-ion anisotropy. To exploit their fascinating electronic and magnetic properties in devices for information storage or spin transport, studies on the preservation or variation of electronic and magnetic functionalities upon adsorption on surfaces are necessary. Herein, we introduced a comprehensive scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS) surface science study, complemented by density functional theory (DFT) simulations, of a recently synthesized single-molecule magnet based on porphyrazine deckers, conveniently equipped with ethyl moieties to make them soluble and sublimable. We demonstrated that the double-decker species were intactly adsorbed on Au(111), Ag(111), and Cu(111) in a flat-on fashion and self-assembled in hexagonal close-packed layers. Systematic multi- and monolayer XPS was performed on the surface-confined species, confirming the preservation of the electronic properties of the ligands and the lanthanide center upon adsorption.
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Affiliation(s)
- B Cirera
- IMDEA Nanoscience, 28049, Madrid, Spain.
| | | | - T Kaposi
- Physik-Department E20, Technische Universität München, 85748, Garching, Germany.
| | - N Giménez-Agulló
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, 43007, Tarragona, Spain.
| | - M Paszkiewicz
- Physik-Department E20, Technische Universität München, 85748, Garching, Germany.
| | - F Klappenberger
- Physik-Department E20, Technische Universität München, 85748, Garching, Germany.
| | - R Otero
- IMDEA Nanoscience, 28049, Madrid, Spain. and Departamento Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - J M Gallego
- IMDEA Nanoscience, 28049, Madrid, Spain. and Instituto de Ciencia de Materiales de Madrid, CSIC, 28049, Madrid, Spain
| | - P Ballester
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, 43007, Tarragona, Spain. and ICREA, Passeig Lluis Companys 23, 08010, Barcelona, Spain
| | - J V Barth
- Physik-Department E20, Technische Universität München, 85748, Garching, Germany.
| | - R Miranda
- IMDEA Nanoscience, 28049, Madrid, Spain. and Departamento Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | - J R Galán-Mascarós
- Institute of Chemical Research of Catalonia (ICIQ), The Barcelona Institute of Science and Technology, 43007, Tarragona, Spain. and ICREA, Passeig Lluis Companys 23, 08010, Barcelona, Spain
| | - W Auwärter
- Physik-Department E20, Technische Universität München, 85748, Garching, Germany.
| | - D Ecija
- IMDEA Nanoscience, 28049, Madrid, Spain.
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11
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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: 30] [Impact Index Per Article: 4.3] [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.
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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
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12
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Choi DJ, Abufager P, Limot L, Lorente N. From tunneling to contact in a magnetic atom: The non-equilibrium Kondo effect. J Chem Phys 2017. [DOI: 10.1063/1.4972874] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Deung-Jang Choi
- CIC nanoGUNE, Tolosa Hiribidea 78, 20018 Donostia-San Sebastian, Spain and IPCMS, CNRS UMR 7504, Université de Strasbourg, 67034 Strasbour, France
| | - Paula Abufager
- Instituto de Física de Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) and Universidad Nacional de Rosario, Bv. 27 de Febrero 210 BIS, 2000 Rosario, Argentina
| | - Laurent Limot
- IPCMS, CNRS UMR 7504, Université de Strasbourg, 67034 Strasbourg, France
| | - Nicolás Lorente
- Centro de Física de Materiales CFM/MPC (CSIC-UPV/EHU), Paseo Manuel de Lardizabal 5, 20018 Donostia-San Sebastián, Spain and Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain
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13
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Choi DJ, Guissart S, Ormaza M, Bachellier N, Bengone O, Simon P, Limot L. Kondo Resonance of a Co Atom Exchange Coupled to a Ferromagnetic Tip. NANO LETTERS 2016; 16:6298-6302. [PMID: 27598512 DOI: 10.1021/acs.nanolett.6b02617] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The Kondo effect of a Co atom on Cu(100) was investigated with a low-temperature scanning tunneling microscope using a monoatomically sharp nickel tip. Upon a tip-Co contact, the differential conductance spectra exhibit a spin-split asymmetric Kondo resonance. The computed ab initio value of the exchange coupling is too small to suppress the Kondo effect, but sufficiently large to produce the splitting observed. A quantitative analysis of the line shape using the numerical renormalization group technique indicates that the junction spin polarization is weak.
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Affiliation(s)
- D-J Choi
- IPCMS, CNRS UMR 7504, Université de Strasbourg , 67034 Strasbourg, France
- CIC nanoGUNE , 20018 Donostia-San Sebastián, Spain
| | - S Guissart
- Laboratoire de Physique des Solides, CNRS UMR 8502, Université Paris-Sud 11 , 91405 Orsay, France
| | - M Ormaza
- IPCMS, CNRS UMR 7504, Université de Strasbourg , 67034 Strasbourg, France
| | - N Bachellier
- IPCMS, CNRS UMR 7504, Université de Strasbourg , 67034 Strasbourg, France
| | - O Bengone
- IPCMS, CNRS UMR 7504, Université de Strasbourg , 67034 Strasbourg, France
| | - P Simon
- Laboratoire de Physique des Solides, CNRS UMR 8502, Université Paris-Sud 11 , 91405 Orsay, France
| | - L Limot
- IPCMS, CNRS UMR 7504, Université de Strasbourg , 67034 Strasbourg, France
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