Comparative Study of Optical and Magneto-Optical Properties of Normal, Disordered and Inverse Spinel Type Oxides
| Autor: | Peter Richter, T. Böntgen, Michael Lorenz, Rüdiger Schmidt-Grund, Vitaly Zviagin, Dietrich R. T. Zahn, Marius Grundmann, Michael Ziese, Georgeta Salvan |
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| Rok vydání: | 2015 |
| Předmět: |
Kerr effect
Materials science Physics::Optics FOS: Physical sciences 02 engineering and technology engineering.material 01 natural sciences Pulsed laser deposition Crystal Condensed Matter::Materials Science Local symmetry 0103 physical sciences Thin film Spectroscopy 010302 applied physics Condensed Matter - Materials Science Condensed matter physics Spinel Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology Condensed Matter Physics Electronic Optical and Magnetic Materials Magneto-optic Kerr effect engineering 0210 nano-technology Physics - Optics Optics (physics.optics) |
| DOI: | 10.48550/arxiv.1505.04664 |
| Popis: | Co$_3$O$_4$, ZnFe$_2$O$_4$, CoFe$_2$O$_4$, ZnCo$_2$O$_4$, and Fe$_3$O$_4$ thin films were fabricated by pulsed laser deposition at high and low temperatures resulting in crystalline single-phase normal, inverse, as well as disordered spinel oxide thin films with smooth surface morphology. The dielectric function, determined by spectroscopic ellipsometry in a wide spectral range from 0.5 eV to 8.5 eV, is compared with the magneto-optical response of the dielectric tensor, investigated by magneto-optical Kerr effect (MOKE) spectroscopy in the spectral range from 1.7 eV to 5.5 eV with an applied magnetic field of 1.7 T. Crystal field, inter-valence and inter-sublattice charge transfer transitions, and transitions from O$_{2p}$ to metal cation 3d or 4s bands are identified in both the principal diagonal elements and the magneto-optically active off-diagonal elements of the dielectric tensor. Depending on the degree of cation disorder, resulting in local symmetry distortion, the magneto-optical response is found to be strongest for high crystal quality inverse spinels and for disordered normal spinel structure, contrary to the first principle studies of CoFe$_2$O$_4$ and ZnFe$_2$O$_4$. The results presented provide a basis for deeper understanding of light-matter interaction in this material system that is of vital importance for device-related phenomena and engineering. Comment: Physica Status Solidi B (Accepted 30.09.2015) |
| Databáze: | OpenAIRE |
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