Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 45: Electronic structure I

O 45.3: Vortrag

Mittwoch, 24. März 2010, 11:00–11:15, H33

Fermi-surface mapping of graphene/Ni(111) and Ni/graphene/Ni(111)Martin Weser1, Alexander Generalov1,2, Carsten Enderlein1, Stefan Böttcher1, Karsten Horn1, Mikhail Fonin3, and •Yuriy Dedkov11Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany — 2St.-Petersburg State University, Russia — 3Universität Konstanz, Germany

Recent ab initio spin-dependent transport calculations have suggested an application of graphene/graphite as a perfect spin filter in ferromagnet/graphene/ferromagnet sandwich-like structures. Due to the overlapping of the electronic structures of graphene layers and the ferromagnetic material for the minority spin only, one can expect a preferential transport of electrons of one kind of spins through this trilayer system. The Ni(111)/graphene/Ni(111) sandwich can be considered as a model system, due to the extremely small lattice mismatch, permitting to study in detail the effects of growth and interactions at interfaces without detrimental effects such as grain boundaries or the formation of Moiré patterns. Here, we present results of LEED, STM, and photoemission studies of the morphology and electronic structure of the graphene/Ni(111) and Ni/graphene/Ni(111) systems. We focus on the investigation of electronic structure of these systems in the vicinity of the Fermi level. These results are presented and discussed in the light of the available band structure calculations. The perspectives of these graphene/ferromagnet interfaces for future spintronics devices are debated.

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