Berlin 2012 – scientific programme
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MA: Fachverband Magnetismus
MA 49: Joint Session "Surface Magnetism III" (jointly with O)
MA 49.9: Talk
Thursday, March 29, 2012, 17:30–17:45, BH 243
Surface morphology and atomic structure of Fe3Si on GaAs(001) and GaAs(110) and magnetic correlations — •Sani Noor1, Igor Barsukov2, M. Samet Özkan1, Lina Elbers1, Nikita Melnichak2, Benjamin Geisler3, Jürgen Lindner2, Peter Kratzer3, and Ulrich Köhler1 — 1Experimentalphysik IV, AG Oberflächen, Ruhr-Universität Bochum — 2Experimentalphysik - AG Farle, Universität Duisburg-Essen — 3Fakultät für Physik and Center for Nanointegration (CeNIDE), Universität Duisburg-Essen
The system Fe3Si/GaAs is a FM/SC combination that possesses properties such as a low lattice mismatch, high thermal stability and half-metallic behaviour that make it an interesting candidate for spintronic devices.
In this contribution we present STM studies of stoichiometric Fe3Si layers grown epitaxially on GaAs(001) and GaAs(110) and compare the structural findings with the magnetic behaviour. From MOKE, SQUID and FMR measurements the magnetic moments as well as the magnetic anisotropies could be determined as a function of the layer thicknesses. Furthermore, we find a transition from superparamagnetic behaviour to ferromagnetic behaviour at a thickness of 3 ML. In accordance with theoretical calculations an enhanced magnetic moment can be observed for thicknesses below 20 ML. We also compare STM simulations of the Fe3Si surface with the experimental filled and empty state images.