Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 53: Spin Structures at Surfaces and in thin films II
MA 53.2: Vortrag
Freitag, 4. April 2014, 09:45–10:00, BEY 118
Tuning of the magnetic properties of Co adatoms on Graphene through interaction with a metal substrate — •Alberto Cavallin1,2, Fabio Donati1, Luca Gragnaniello1, Fabian D. Natterer1, François Patthey1, Quentin Dubout1, Jan Dreiser1,3, Cinthia Piamonteze3, Frithjof Nolting3, Stefano Rusponi1, and Harald Brune1 — 1Institute of Condensed Matter Physics (ICMP), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland — 2present address: Max-Planck-Institut für Mikrostrukturphysik, Halle (Saale), Germany — 3Swiss Light Source (SLS), Paul Scherrer Institut (PSI), Villigen, Switzerland.
The magnetic properties of adatoms on graphene (G) are extremely relevant in view of potential applications in spintronics. Nowadays large efforts are devoted to predict the physics of long range interactions between magnetic moments localized on Co and Fe adatoms and mediated by the graphene conduction electrons.1
The magnetic ground state and anisotropy of Co adatoms on G are however much debated at present.2 Here, we show a strong dependence of these properties on the metal substrate on which G is grown. A state of the art investigation based on XAS, XMCD, STM, STS and multiplet calculations reveals large spin and orbital moments, and an out-of-plane easy axis for Co/G/Ru(0001), while it shows comparatively weak magnetic moments and anisotropy for Co/G/Ir(111).
1 S. R. Power and M. S. Ferreira, Crystals, 3, 49 (2013).
2 F. Donati, Q. Dubout et al., Phys. Rev. Lett. 111, (2013), and references therein.