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HL: Fachverband Halbleiterphysik

HL 39: Posters II (Topological insulators; Graphene; Spintronics and spin physics; Quantum information science)

HL 39.19: Poster

Dienstag, 17. März 2015, 14:00–20:00, Poster F

Thermal induced lattice distortion of diluted magnetic semiconductors — •Holger Göhring, Michael Paulus, Thomas Büning, Simon Wulle, Karin Esch, Christian Sternemann, Manfred Bayer, and Metin Tolan — Fakultät Physik/DELTA, Technische Universität Dortmund, 44221, Germany

Diluted magnetic semiconductors, which combine the properties of semiconductors and ferromagnets have been an important subject in materials science. Semiconductors with Curie temperatures above room temperature could revolutionize the field of spintronics by allowing control of the magnetization via application of voltage as observed e.g. for the ferromagnetic material galfenol. Magnetic semiconductors, which are currently under investigation, still show a rather low Curie temperature making them inapplicable for application. However, GaMnAs seems to be a promising candidate for high Curie temperature material. GaMnAs is typically grown epitaxially on GaAs substrates with a limited manganese content of a few percent. This system was studied intensively in the past years. To understand the relation between ferromagnetic and structural properties, high resolution x-ray diffraction experiments were performed at beamline BL9 of DELTA using a photon energy of 20 keV and a helium flow cryostate setup. The small changes in the GaMnAs lattice were determined by measuring both, the GaAsMn (004) and the GaAs(004) reflection of the substrate which serves as an internal reference. Our investigation hints on an impact of the ferromagnetic order on the lattice of GaMnAs. However, the data analysis is still in progress.