Regensburg 2010 – wissenschaftliches Programm
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KR: Fachverband Kristallographie
KR 10: Poster: Multiferroics (with MA, DF, KR, DS)
KR 10.45: Poster
Dienstag, 23. März 2010, 10:45–13:45, Poster A
Structural and magnetic investigations of Fe and Fe3Si as CEO-grown spin aligning layers on spin LEDs — •Sani Noor1, Carsten Godde1, Hasmik Harutyunyan1, Arne Ludwig2, Mingyuan Li3, Gregor Nowak1, Dirk Reuter2, Martin Hofmann3, Hartmut Zabel1, Andreas Wieck2, and Ulrich Köhler1 — 1Experimentalphysik IV, Ruhr-Universität Bochum — 2Angewandte Festkörperphysik, Ruhr-Universität Bochum — 3Photonik und Terahertztechnologie, Ruhr-Universität Bochum
We focus on the the structural and magnetic properties of Fe and Fe/MgO as spin injection layers on the GaAs(110) cleaved edge of spin LEDs. Within the scope of our work, we have developed an in situ process to cleave the sample within a µ m range of the designated edge and deposit the layers. We show a MOKE study of the magnetization behaviour in the case of Fe which forms a Schottky barrier on n-GaAs and Fe with an MgO interlayer as a tunnelling barrier as a function of the layer thickness. STM images of Fe grown on µ m-wide terraces of the cleaved GaAs(110) surface are also presented. Finally, we discuss the results of electroluminescence measurements to determine the efficiency of spin injection across the cleaved edge.
We furthermore present an STM growth study of Fe3Si/GaAs which as a Heusler alloy is also a possible candidate as a spin aligner. In contrast to Fe/GaAs we find layer-by-layer growth even above RT. Epitaxial and stoichiometrical quality has been confirmed by XRD and LEED. Our angular dependent in situ MOKE measurements show that the Fe3Si/GaAs(001) system exhibits only a weak magnetic anisotropy.