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

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    Complex Magnetic Exchange Coupling between Co Nanostructures and Ni(111) across Epitaxial Graphene
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    † 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
    *(A.B.) E-mail: [email protected]
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    ACS Nano

    Cite this: ACS Nano 2016, 10, 1, 1101–1107
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    https://doi.org/10.1021/acsnano.5b06410
    Published November 20, 2015
    Copyright © 2015 American Chemical Society
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    Abstract

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    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.

    Copyright © 2015 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsnano.5b06410.

    • Complete coverage dependence of the Co XMCD, XAS and XMCD measurements on Co/Ni(111), and calculated exchange coupling for the bridge-top stacking of graphene on the Ni(111) surface (PDF)

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    ACS Nano

    Cite this: ACS Nano 2016, 10, 1, 1101–1107
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acsnano.5b06410
    Published November 20, 2015
    Copyright © 2015 American Chemical Society
    Request reuse permissions

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