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O: Fachverband Oberflächenphysik

O 14: Surface or Interface Magnetism

O 14.3: Talk

Monday, February 25, 2008, 15:45–16:00, MA 043

A possible source of spin-polarized electrons: The inert graphene/Ni(111) system — •Yury Dedkov¹, Mikhail Fonin², and Clemens Laubschat¹ — ¹Institut für Festkörperphysik, Technische Universität Dresden, Germany — ²Fachbereich Physik, Universität Konstanz, Germany

We report on an investigation of spin-polarized secondary electron emission from the chemically inert system: graphene/Ni(111). An ordered passivated graphene layer (monolayer of graphite, MG) was formed on Ni(111) surface via cracking of propylene gas. The spin-polarization of the secondary electrons obtained from this system upon photoemission is only slightly lower than the one from the clean Ni surface, but does not change upon large oxygen exposure. These results suggest to use such passivated Ni(111) surface as a source of spin-polarized electrons which is stable against adsorption of reactive gases.