Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 57: Graphene: SiC Substrates and Intercalation (jointly with HL, MA and TT)
O 57.11: Vortrag
Mittwoch, 13. März 2013, 18:30–18:45, H17
Magnetism of graphene/Ir(111) intercalation systems — •Régis Decker1, Jens Brede1, Nicolae Atodiresei2, Vasile Caciuc2, Stefan Blügel2, and Roland Wiesendanger1 — 1Institute of Applied Physics, University of Hamburg, Jungiusstrasse 11, D-30355 Hamburg — 2Peter Grünberg Institute and Institute for Advanced Simulation, Forschungzentrum Jülich, D-52425 Jülich
The presence of intercalation compounds in graphite, i.e. impurities or layer(s) trapped between carbon sheets, can lead to changes in the transport, optical and catalytic properties compared to bulk graphite, or even to superconductivity. The intercalation of elements between graphene and its substrate can also influence the properties of graphene. Furthermore, this approach opens a new route to explore the behavior of graphene on a magnetic substrate.
Here, we present the local structure and magnetic properties of graphene on magnetic substrates, resolved by spin-polarized STM. The magnetic substrates are obtained by the intercalation of 3d elements (Co and Fe) between graphene and the Ir(111) surface [1]. In both cases, the atomic structure of the graphene layer is dominated by a highly corrugated Moiré pattern. Within the Moiré pattern different regions are identified. Interestingly, these regions show very different electronic and magnetic signatures in the experiments. The experimental observations are compared to state-of-the-art first principles density functional theory calculations.
[1] Atomic-scale magnetism of cobalt-intercalated graphene. R. Decker et al., accepted in Phys. Rev. B (Rapid Comm.).