Complex Magnetic Exchange Coupling between Co Nanostructures and Ni(111) across Epitaxial Graphene.
- Barla A Istituto di Struttura della Materia (ISM), Consiglio Nazionale delle Ricerche (CNR) , I-34149 Trieste, Italy.
- Bellini V S3-Istituto di Nanoscienze-CNR , Via Campi 213/A, I-41125 Modena, Italy.
- Rusponi S Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL) , Station 3, CH-1015 Lausanne, Switzerland.
- Ferriani P Institute of Theoretical Physics and Astrophysics, University of Kiel , D-24098 Kiel, Germany.
- Pivetta M Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL) , Station 3, CH-1015 Lausanne, Switzerland.
- Donati F Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL) , Station 3, CH-1015 Lausanne, Switzerland.
- Patthey F Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL) , Station 3, CH-1015 Lausanne, Switzerland.
- Persichetti L Department of Materials, ETH Zurich , CH-8093 Zurich, Switzerland.
- Mahatha SK Istituto di Struttura della Materia (ISM), Consiglio Nazionale delle Ricerche (CNR) , I-34149 Trieste, Italy.
- Papagno M Dipartimento di Fisica, Università della Calabria , I-87036 Arcavacata di Rende (Cs), Italy.
- Piamonteze C Swiss Light Source, Paul Scherrer Institut , CH-5232 Villigen PSI, Switzerland.
- Fichtner S Institute of Theoretical Physics and Astrophysics, University of Kiel , D-24098 Kiel, Germany.
- Heinze S Institute of Theoretical Physics and Astrophysics, University of Kiel , D-24098 Kiel, Germany.
- Gambardella P Department of Materials, ETH Zurich , CH-8093 Zurich, Switzerland.
- Brune H Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL) , Station 3, CH-1015 Lausanne, Switzerland.
- Carbone C Istituto di Struttura della Materia (ISM), Consiglio Nazionale delle Ricerche (CNR) , I-34149 Trieste, Italy.
- 2015-11-21
Published in:
- ACS nano. - 2016
X-ray magnetic circular dichroism (XMCD)
density functional theory (DFT)
graphene
magnetic exchange interaction
scanning tunneling microscopy (STM)
English
We report on the magnetic coupling between isolated Co atoms as well as small Co islands and Ni(111) mediated by an epitaxial graphene layer. X-ray magnetic circular dichroism and scanning tunneling microscopy combined with density functional theory calculations reveal that Co atoms occupy two distinct adsorption sites, with different magnetic coupling to the underlying Ni(111) surface. We further report a transition from an antiferromagnetic to a ferromagnetic coupling with increasing Co cluster size. Our results highlight the extreme sensitivity of the exchange interaction mediated by graphene to the adsorption site and to the in-plane coordination of the magnetic atoms.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1021/acsnano.5b06410
- PMID 26588469
- Persistent URL
- https://sonar.rero.ch/global/documents/229207
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