Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 12: Graphene: Transport
(Joint session of DS, DY, HL, MA, O and TT organized by HL)
TT 12.3: Vortrag
Montag, 7. März 2016, 15:30–15:45, H17
Magnetic exchange coupling across a graphene layer — •Alessandro Barla1, Valerio Bellini2, Stefano Rusponi3, Paolo Ferriani4, Marina Pivetta3, Fabio Donati3, François Patthey3, Luca Persichetti5, Sanjoy K. Mahatha1, Marco Papagno6, Cinthia Piamonteze7, Simon Fichtner4, Stefan Heinze4, Pietro Gambardella5, Harald Brune3, and Carlo Carbone1 — 1Istituto di Struttura della Materia, CNR, I-34149 Trieste, Italy — 2S3-Istituto di Nanoscienze-CNR, I-41125 Modena, Italy — 3Institute of Condensed Matter Physics, EPFL, CH-1015 Lausanne, Switzerland — 4Institute of Theoretical Physics and Astrophysics, University of Kiel, D-24098 Kiel, Germany — 5Department of Materials, ETH Zürich, CH-8093 Zürich, Switzerland — 6Dipartimento di Fisica, Universitá della Calabria, I-87036 Arcavacata di Rende, Italy — 7Swiss Light Source, PSI, CH-5232 Villigen PSI, Switzerland
In order to access the potential of graphene in spintronic devices, its ability to mediate magnetic exchange interactions has to be verified. We present the results of our investigations of the magnetic coupling between Co atoms and Ni(111) mediated by epitaxial graphene. Experimental and theoretical calculations reveal that individual 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 coverage. 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.