Graphene/Ni(111) System: Spin- and Angle-Resolved Photoemission Studies

Details Graphene/Ni(111) System: Spin- and Angle-Resolved Photoemission Studies Graphene/Ni(111) System: Spin- and Angle-Resolved Photoemission Studies

2008-06-09

arxiv.org/abs/0806.1407v1

Physics

Condensed Matter

Materials Science

3 pages, 3 figures

Scientific paper

Here we report spin- and angle-resolved photoemission studies of the inert graphene layer formed on the surface of a ferromagnetic material, Ni(111). X-ray photoemission and spin-resolved spectroscopy of secondary electrons reveal that graphene behaves like a protection layer on the Ni(111) surface preventing its reaction with adsorbed oxygen. Angle-resolved photoelectron spectroscopy of $\pi$ states of graphene on Ni(111) shows a strong dependence of binding energy of these states on the direction of magnetization of the sample. We conclude that the observed extraordinary high "splitting" up to 225 meV of the $\pi$ band in the graphene layer is a manifes-tation of the Rashba effect which provides a direct possibility to a flexible control of an electron spin in a graphene-based spin-FET.

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