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Datta S, Weymann I, Płomińska A, Flahaut E, Marty L, Wernsdorfer W. Detection of Spin Reversal via Kondo Correlation in Hybrid Carbon Nanotube Quantum Dots. ACS NANO 2019; 13:10029-10035. [PMID: 31449383 DOI: 10.1021/acsnano.9b02091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We experimentally investigate the electronic transport through a double-wall carbon nanotube filled with Fe nanoparticles. At very low temperatures, the Kondo effect is observed between the confined electrons in the nanotube quantum dot and the delocalized electrons in the leads connecting the nanotube. We demonstrate that the presence of magnetic nanoparticles in the inner core of the nanotube results in a hysteretic behavior of the differential resistance of the system when the magnetic field is varied. This behavior is observed in the Kondo diamonds of the stability diagram, and the magnitude of hysteresis varies with the strength of the Kondo correlations in different diamonds. Our findings are corroborated with accurate numerical renormalization group calculations performed for an effective low-energy model involving fluctuations of the spin on the orbital level of the nanotube due to spin flips of the nanoparticles.
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Affiliation(s)
- Subhadeep Datta
- School of Physical Sciences , Indian Association for the Cultivation of Science , 2A & B Raja S. C. Mullick Road , Jadavpur, Kolkata 700032 , India
- Institut Néel , CNRS & Université Joseph Fourier, BP 166, F-38042 Grenoble Cedex 9 , France
| | - Ireneusz Weymann
- Faculty of Physics , Adam Mickiewicz University , ul. Uniwersytetu Poznańskiego 2 , 61-614 Poznań , Poland
| | - Anna Płomińska
- Faculty of Physics , Adam Mickiewicz University , ul. Uniwersytetu Poznańskiego 2 , 61-614 Poznań , Poland
| | - Emmanuel Flahaut
- CIRIMAT , Université de Toulouse , CNRS, INPT, UPS, UMR CNRS-UPS-INP No 5085, Université Toulouse 3 Paul Sabatier, Bât. CIRIMAT, 118, Route de Narbonne , 31062 Toulouse Cedex 9 , France
| | - Läetitia Marty
- Institut Néel , CNRS & Université Joseph Fourier, BP 166, F-38042 Grenoble Cedex 9 , France
| | - Wolfgang Wernsdorfer
- Institut Néel , CNRS & Université Joseph Fourier, BP 166, F-38042 Grenoble Cedex 9 , France
- Physikalisches Institut and Institute of Nanotechnology , Karlsruhe Institute of Technology , Wolfgang-Gaede-Strasse 1 , 76131 Karlsruhe , Germany
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Cabana L, Bourgognon M, Wang JTW, Protti A, Klippstein R, de Rosales RTM, Shah AM, Fontcuberta J, Tobías-Rossell E, Sosabowski JK, Al-Jamal KT, Tobias G. The Shortening of MWNT-SPION Hybrids by Steam Treatment Improves Their Magnetic Resonance Imaging Properties In Vitro and In Vivo. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2016; 12:2893-2905. [PMID: 27079833 DOI: 10.1002/smll.201502721] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Revised: 03/09/2016] [Indexed: 06/05/2023]
Abstract
Carbon nanotubes (CNTs) have been advocated as promising nanocarriers in the biomedical field. Their high surface area and needle-like shape make these systems especially attractive for diagnostic and therapeutic applications. Biocompatibility, cell internalization, biodistribution, and pharmacokinetic profile have all been reported to be length dependent. In this study, further insights are gotten on the role that the length of CNTs plays when developing novel contrast agents for magnetic resonance imaging (MRI). Two samples of CNTs with different length distribution have been decorated with radio-labeled iron oxide nanoparticles. Despite characterization of the prepared hybrids reveals a similar degree of loading and size of the nanoparticles for both samples, the use of short CNTs is found to enhance the MRI properties of the developed contrast agents both in vitro and in vivo compared to their long counterparts.
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Affiliation(s)
- Laura Cabana
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193, Bellaterra, Barcelona, Spain
| | - Maxime Bourgognon
- Institute of Pharmaceutical Science, King's College London, London, SE1 9NH, UK
| | - Julie T-W Wang
- Institute of Pharmaceutical Science, King's College London, London, SE1 9NH, UK
| | - Andrea Protti
- Division of Imaging Sciences and Biomedical Engineering, King's College London, St. Thomas' Hospital, London, SE1 7EH, UK
- Cardiovascular Division, James Black Centre, British Heart Foundation Centre of Excellence, King's College London, London, SE5 9NU, UK
| | - Rebecca Klippstein
- Institute of Pharmaceutical Science, King's College London, London, SE1 9NH, UK
| | - Rafael T M de Rosales
- Division of Imaging Sciences and Biomedical Engineering, King's College London, St. Thomas' Hospital, London, SE1 7EH, UK
| | - Ajay M Shah
- Cardiovascular Division, James Black Centre, British Heart Foundation Centre of Excellence, King's College London, London, SE5 9NU, UK
| | - Josep Fontcuberta
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193, Bellaterra, Barcelona, Spain
| | - Ester Tobías-Rossell
- Escola Universitària de Ciències de la Salut de Manresa, Universitat de Vic-Universitat Central de Catalunya, Av. Universitària 4-6, 08242, Manresa, Barcelona, Spain
| | - Jane K Sosabowski
- Centre for Molecular Oncology, Barts Cancer Institute, Queen Mary University of London, London, EC1A 7BE, UK
| | - Khuloud T Al-Jamal
- Institute of Pharmaceutical Science, King's College London, London, SE1 9NH, UK
| | - Gerard Tobias
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193, Bellaterra, Barcelona, Spain
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Crisan AD, Datta S, Viennot JJ, Delbecq MR, Cottet A, Kontos T. Harnessing spin precession with dissipation. Nat Commun 2016; 7:10451. [PMID: 26816050 PMCID: PMC4737848 DOI: 10.1038/ncomms10451] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Accepted: 12/10/2015] [Indexed: 11/11/2022] Open
Abstract
Non-collinear spin transport is at the heart of spin or magnetization control in spintronics devices. The use of nanoscale conductors exhibiting quantum effects in transport could provide new paths for that purpose. Here we study non-collinear spin transport in a quantum dot. We use a device made out of a single-wall carbon nanotube connected to orthogonal ferromagnetic electrodes. In the spin transport signals, we observe signatures of out of equilibrium spin precession that are electrically tunable through dissipation. This could provide a new path to harness spin precession in nanoscale conductors.
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Affiliation(s)
- A. D. Crisan
- Laboratoire Pierre Aigrain, Ecole Normale Supérieure-PSL Research University, CNRS, Université Pierre et Marie Curie-Sorbonne Universités, Université Paris Diderot-Sorbonne Paris Cité, 24 rue Lhomond, 75231 Paris, France
| | - S. Datta
- Laboratoire Pierre Aigrain, Ecole Normale Supérieure-PSL Research University, CNRS, Université Pierre et Marie Curie-Sorbonne Universités, Université Paris Diderot-Sorbonne Paris Cité, 24 rue Lhomond, 75231 Paris, France
| | - J. J. Viennot
- Laboratoire Pierre Aigrain, Ecole Normale Supérieure-PSL Research University, CNRS, Université Pierre et Marie Curie-Sorbonne Universités, Université Paris Diderot-Sorbonne Paris Cité, 24 rue Lhomond, 75231 Paris, France
| | - M. R. Delbecq
- Laboratoire Pierre Aigrain, Ecole Normale Supérieure-PSL Research University, CNRS, Université Pierre et Marie Curie-Sorbonne Universités, Université Paris Diderot-Sorbonne Paris Cité, 24 rue Lhomond, 75231 Paris, France
| | - A. Cottet
- Laboratoire Pierre Aigrain, Ecole Normale Supérieure-PSL Research University, CNRS, Université Pierre et Marie Curie-Sorbonne Universités, Université Paris Diderot-Sorbonne Paris Cité, 24 rue Lhomond, 75231 Paris, France
| | - T. Kontos
- Laboratoire Pierre Aigrain, Ecole Normale Supérieure-PSL Research University, CNRS, Université Pierre et Marie Curie-Sorbonne Universités, Université Paris Diderot-Sorbonne Paris Cité, 24 rue Lhomond, 75231 Paris, France
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La Torre A, Gimenez-Lopez MDC, Fay MW, Lucas CH, Brown PD, Khlobystov AN. Dynamics of Gold Nanoparticles on Carbon Nanostructures Driven by van der Waals and Electrostatic Interactions. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:2756-2761. [PMID: 25689488 DOI: 10.1002/smll.201402807] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Revised: 10/17/2014] [Indexed: 06/04/2023]
Abstract
Transmission electron microscopy studies on the assembly and growth of gold nanoparticles on carbon nanotubes supported on few-layer graphene and amorphous carbon reveal a competition between van der Waals forces and electrostatic interactions, enabling controlled positioning and sizing of adsorbed nanoparticles at the nanochannels formed between the carbon nanotube and the few-layer graph-ene surface.
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Affiliation(s)
- Alessandro La Torre
- School of Chemistry, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | | | - Michael W Fay
- Nottingham Nanoscience and Nanotechnology Centre, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Carlos Herreros Lucas
- School of Chemistry, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Paul D Brown
- Division of Materials, Mechanics and Structures, Department of Mechanical, Materials and Manufacturing Engineering, Faculty of Engineering, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Andrei N Khlobystov
- School of Chemistry, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK
- Nottingham Nanoscience and Nanotechnology Centre, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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Cervetti C, Heintze E, Bogani L. Interweaving spins with their environment: novel inorganic nanohybrids with controllable magnetic properties. Dalton Trans 2014; 43:4220-32. [PMID: 24514949 DOI: 10.1039/c3dt52650j] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We discuss the developments in the synthesis and characterization of magnetic nanohybrids made of molecular magnets and nanostructured materials.
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Affiliation(s)
| | - Eric Heintze
- Physikalisches Institut
- Universität Stuttgart
- Stuttgart, Germany
| | - Lapo Bogani
- Physikalisches Institut
- Universität Stuttgart
- Stuttgart, Germany
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Ganzhorn M, Klyatskaya S, Ruben M, Wernsdorfer W. Carbon nanotube nanoelectromechanical systems as magnetometers for single-molecule magnets. ACS NANO 2013; 7:6225-36. [PMID: 23802618 DOI: 10.1021/nn402968k] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Due to outstanding mechanical and electronic properties, carbon nanotube nanoelectromechanical systems (NEMS) were recently proposed as ultrasensitive magnetometers for single-molecule magnets (SMM). In this article, we describe a noninvasive grafting of a SMM on a carbon nanotube NEMS, which conserves both the mechanical properties of the carbon nanotube NEMS and the magnetic properties of the SMM. We will demonstrate that the nonlinearity of a carbon nanotube's mechanical motion can be used to probe the reversal of a molecular spin, associated with a bis(phthalocyaninato)terbium(III) single-molecule magnet, providing an experimental evidence for the detection of a single spin by a mechanical degree of freedom on a molecular level.
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Affiliation(s)
- Marc Ganzhorn
- Institut Néel, CNRS & Université Joseph Fourier, BP 166, 25 Avenue des Martyrs, 38042 Grenoble Cedex 9, France
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Lee JS, Park JW, Song JY, Kim J. Asymmetric magnetoconductance and magneto-Coulomb effect in a carbon nanotube single electron transistor. NANOTECHNOLOGY 2013; 24:195201. [PMID: 23579569 DOI: 10.1088/0957-4484/24/19/195201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We report single step-like asymmetric magnetoconductance from a double-walled carbon nanotube single electron transistor contacted by ferromagnetic cobalt electrodes. The device conductance changed significantly when the direction of the applied magnetic field was reversed, but did not show the spin-valve-type double extrema feature near the coercive field of the electrodes. The magnetoconductance also showed quasi-periodic sign-reversing oscillations with respect to the applied bias. The bias-dependent oscillation of the magnetoconductance was compared with the quantum dot stability diagram for the device. As a result, it was confirmed that the asymmetric magnetoconductance was caused by the magneto-Coulomb effect.
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Affiliation(s)
- Joon Sung Lee
- Korea Research Institute of Standards and Science, Daejeon, Republic of Korea
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Zanolli Z, Charlier JC. Single-molecule sensing using carbon nanotubes decorated with magnetic clusters. ACS NANO 2012; 6:10786-91. [PMID: 23121687 DOI: 10.1021/nn304111a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
First-principles and nonequilibrium Green's function techniques are used to investigate magnetism and spin-polarized quantum transport in metallic carbon nanotubes (CNT) decorated with transition metal (Ni(13), Pt(13)) magnetic nanoclusters (NC). For small cluster sizes, the strong CNT-NC interaction induces spin-polarization in the CNT. The adsorption of a benzene molecule is found to drastically modify the CNT-NC magnetization. Such a magnetization change should be large enough to be detected via magnetic-AFM or SQUID magnetometry, hence suggesting a novel approach for single-molecule gas detection.
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Affiliation(s)
- Zeila Zanolli
- Physique Théorique des Matériaux, Université de Liège, B-4000 Sart Tilman, Belgium.
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Burzurí E, Zyazin AS, Cornia A, van der Zant HSJ. Direct observation of magnetic anisotropy in an individual Fe4 single-molecule magnet. PHYSICAL REVIEW LETTERS 2012; 109:147203. [PMID: 23083275 DOI: 10.1103/physrevlett.109.147203] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2012] [Indexed: 06/01/2023]
Abstract
We study three-terminal charge transport through individual Fe4 single-molecule magnets. Magnetic anisotropy of the single molecule is directly observed by introducing a spectroscopic technique based on measuring the position of the degeneracy point as a function of gate voltage and applied magnetic field. A nonlinear field-dependence is observed which changes by rotating the sample and is, thus, a direct proof of magnetic anisotropy. The sensitivity of this method allows us to observe small changes in the orientation and magnitude of the anisotropy in different charge states. We find that the easy axes in adjacent states are (almost) collinear.
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Affiliation(s)
- E Burzurí
- Kavli Institute of Nanoscience, Delft University of Technology, P.O. Box 5046, 2600 GA Delft, The Netherlands.
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La Torre A, Giménez-López MDC, Fay MW, Rance GA, Solomonsz WA, Chamberlain TW, Brown PD, Khlobystov AN. Assembly, growth, and catalytic activity of gold nanoparticles in hollow carbon nanofibers. ACS NANO 2012; 6:2000-2007. [PMID: 22356571 DOI: 10.1021/nn300400z] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Graphitized carbon nanofibers (GNFs) act as efficient templates for the growth of gold nanoparticles (AuNPs) adsorbed on the interior (and exterior) of the tubular nanostructures. Encapsulated AuNPs are stabilized by interactions with the step-edges of the individual graphitic nanocones, of which GNFs are composed, and their size is limited to approximately 6 nm, while AuNPs adsorbed on the atomically flat graphitic surfaces of the GNF exterior continue their growth to 13 nm and beyond under the same heat treatment conditions. The corrugated structure of the GNF interior imposes a significant barrier for the migration of AuNPs, so that their growth mechanism is restricted to Ostwald ripening. Conversely, nanoparticles adsorbed on smooth GNF exterior surfaces are more likely to migrate and coalesce into larger nanoparticles, as revealed by in situ transmission electron microscopy imaging. The presence of alkyl thiol surfactant within the GNF channels changes the dynamics of the AuNP transformations, as surfactant molecules adsorbed on the surface of the AuNPs diminished the stabilization effect of the step-edges, thus allowing nanoparticles to grow until their diameters reach the internal diameter of the host nanofiber. Nanoparticles thermally evolved within the GNF channel exhibit alignment, perpendicular to the GNF axis due to interactions with the step-edges and parallel to the axis because of graphitic facets of the nanocones. Despite their small size, AuNPs in GNF possess high stability and remain unchanged at temperatures up to 300 °C in ambient atmosphere. Nanoparticles immobilized at the step-edges within GNF are shown to act as effective catalysts promoting the transformation of dimethylphenylsilane to bis(dimethylphenyl)disiloxane with a greater than 10-fold enhancement of selectivity as compared to free-standing or surface-adsorbed nanoparticles.
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Affiliation(s)
- Alessandro La Torre
- School of Chemistry,Department of Mechanical, Materials and Manufacturing Engineering, Faculty of Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
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