journal article·2016-01-26Open access

Complex Magnetic Exchange Coupling between Co Nanostructures and Ni(111) across Epitaxial Graphene

Alessandro Barla, Valerio Bellini, Stefano Rusponi, Paolo Ferriani, Marina Pivetta, Fabio Donati, François Patthey, Luca Persichetti, Sanjoy K. Mahatha, Marco Papagno, Cinthia Piamonteze, Simon Fichtner, Stefan Heinze, Pietro Gambardella, Harald Brune, Carlo Carbone

ACS Nano· Volume 10· Issue 1

Abstract

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.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Graphene research and applications · Magnetic properties of thin films · Quantum and electron transport phenomena

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Istituto di Struttura della Materia (ISM), Consiglio Nazionale delle Ricerche (CNR), I-34149 Trieste, Italy

S3-Istituto di Nanoscienze-CNR, Via Campi 213/A, I-41125 Modena, Italy

Institute of Condensed Matter Physics (ICMP), Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland

Institute of Theoretical Physics and Astrophysics, University of Kiel, D-24098 Kiel, Germany

Department of Materials, ETH Zurich, CH-8093 Zurich, Switzerland

Dipartimento di Fisica, Università della Calabria, I-87036 Arcavacata di Rende (Cs), Italy

Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland

Funding

Eidgenössische Technische Hochschule Zürich · Schweizerische Nationalfonds zur Förderung der Wissenschaftlichen Forschung · Deutsche Forschungsgemeinschaft · Seventh Framework Programme · Ministero dell'Istruzione, dell'Università e della Ricerca

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