Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 38: Spintronics
O 38.5: Talk
Tuesday, March 8, 2016, 15:00–15:15, S051
Ab initio investigation of a novel spin-filter: Graphene on Ir(111) — •Christian Mende1, Stephan Borek1, Jürgen Braun1, Gustav Bihlmayer2, Dima Kutnyakhov3, Hans-Joachim Elmers3, Gerd Schönhense3, Jan Minár1,4, and Hubert Ebert1 — 1Ludwig-Maximilians-Universität München — 2Forschungzentrum Jülich — 3Johannes-Gutenberg-Universität Mainz — 4University of West Bohemia Pilsen
For the determination of the spin-polarized band structure in angle-resolved photoemission (ARPES) experiments an application of materials as reflection mirrors is recommended. For this purpose one uses the spin-dependent scattering of photoelectrons from suitable surfaces based on either exchange or spin-orbit induced scattering. We present our calculations of spin-polarized low energy electron diffraction (SPLEED) patterns for the clean Ir(111) and the Graphene covered Ir(111) surface. For these materials the electron scattering is strongly influenced by spin-orbit interaction whereas the Graphene layer provides a longer lifetime of the spin-polarizing mirror due to its inert properties concerning surface contamination. Based on ab initio calculations of the electronic structure we obtained diffraction patterns over a wide range of kinetic energies and polar angles to determine the applicability of the Ir(111)+Graphene system as spin-polarizing mirror. Additionally we investigated ARPES spectra to connect the electronic structure calculations to the corresponding experiment.