Regensburg 2007 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 46: Poster 2

HL 46.42: Poster

Donnerstag, 29. März 2007, 15:00–17:30, Poster A

Comparison of giant Faraday effects in ZnMnSe and ZnMnO studied by magneto-optic ellipsometry — •Mario Saenger¹, Lars Hartmann², Heidemarie Schmidt², Michael Hetterich³, Michael Lorenz², Holger Hochmuth², Marius Grundmann², Tino Hofmann¹, and Mathias Schubert¹ — ¹Nebraska Center for Materials and Nanoscience, Department of Electrical Engineering, University of Nebraska-Lincoln, NE 68588-0511, U.S.A. — ²Institute for Experimental Physics II, Faculty of Physics and Geosciences, University of Leipzig, Linnéstr. 5, D-04103 Leipzig, Germany — ³Institute of Applied Physics and Center for Functional Nanostructures (CFN), University of Karlsruhe, Wolfgang-Gaede-Str. 1, D-76131 Karlsruhe Germany

The diluted magnetic semiconductors ZnMnSe and ZnMnO are promising materials to create spin aligners for possible application in future spintronic devices. At room temperature Zn_1−xMn_xSe is paramagnetic, and reveals giant Faraday magneto-optical effects in the visible spectral range. In contrast, a very weak Faraday effect in Zn_0.9Mn_0.1Se was found. We report a quantitative analysis of the anisotropic complex dielectric functions for Zn_1−xMn_xSe in external magnetic field using a modified critical-point dielectric function model. Magneto-optic generalized ellipsometry in the Faraday configuration was applied to investigate a series of Zn_1−xMn_xSe samples (x=0, 0.02, 0.14, 0.28) grown by MBE on GaAs (001) substrate, and a Zn_0.9Mn_0.1O sample grown by PLD on a-plane sapphire substrate. The studied spectral range was from 2 to 3 eV and for magnetic fields up to 1.2 T.