Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)
MA 63.42: Poster
Freitag, 18. März 2011, 11:00–14:00, P2
Fabrication and characterisation of ferromagnetic layers for CEO Spin LEDs — Wera Fehl1, Carsten Godde1, Sani Noor1, Arne Ludwig2, Henning Soldat3, Andreas Wieck2, •Martin Hofmann3, and Ulrich Köhler1 — 1Institut für Experimentalphysik IV, AG Oberflächen, Ruhr-Universität Bochum — 2Lehrstuhl für angewandte Festkörperphysik, Ruhr-Universität Bochum — 3Lehrstuhl für Photonik und Terahertztechnologie, Ruhr-Universität Bochum
The purpose of this project is the spin injection via Fe and Fe/MgO on GaAs(110). We employ cleaved edge overgrowth (CEO) which means cleaving of the samples with an LED structure in UHV and in situ deposition of the ferromagnetic layers under variable angles with respect to the cleaved surface. This geometry allows us to use thin films with an in plane magnetization. Due to the sample structure we can produce spin injection lenghts in the µm range. The optically active region consists of quantum dots embedded in intrinsic GaAs. Polarization dependent electroluminescense measurements have been made in order to determine the degree of circular polarization as a function of the applied magnetic field. Furthermore, we made micromagnetic simulations using OOMMF to get information about possible effects of the ferromagnetic film boundary on the domain structure.