Berlin 2015 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 37: Focussed Session: Oxide semiconductors II (joint session with HL)
DS 37.2: Vortrag
Donnerstag, 19. März 2015, 15:30–15:45, H 2032
Optical and Magneto-Optical Investigation of Spinel Oxide Thin Films — •Vitaly Zviagin1, Peter Richter2, Christian Kranert1, Tammo Böntgen1, Michael Lorenz1, Dietrich R.T. Zahn2, Georgeta Salvan2, Rüdiger Schmidt-Grund1, and Marius Grundmann1 — 1Universtät Leipzig, Institut für Experimentelle Physik II, Linnéstr. 5, Germany — 2Technische Universtät Chemnitz, Semiconductor Physics, Reichenheiner Str. 70, Germany
We present a (magneto-) optical and structural investigation of Co3O4, ZnFe2O4, CoFe2O4, ZnCo2O4 and Fe3O4 spinel oxides grown at different temperatures on MgO (100) and MgAl2O4 (100) substrates by pulsed laser deposition. The optical properties were determined by spectroscopic ellipsometry in the spectral range from 0.5 eV to 8.5 eV and at temperatures from 10 K to 300 K. The magneto-optical response was measured in the range from 1.5 ev to 5.5 eV at room temperature and with an applied magnetic field of 1.7 T. A parametric model for the dielectric function, consisting of Gaussian and Lorenzian functions located at the optical transition energies, as well as the off-diagonal elements of the dielectric tensor were obtained. The magneto-optical response depends markedly on the crystal quality thus indicating the occurrence of mixtures of normal and inverse spinel structures. The study of (magneto-) optical properties is accompanied by structural analysis of the thin films using Raman spectroscopy, atomic force microscopy, and X-ray diffraction.