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Dresden 2017 – scientific programme

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DS: Fachverband Dünne Schichten

DS 39: Thin Film Applications

DS 39.5: Talk

Thursday, March 23, 2017, 10:30–10:45, CHE 91

Optical Investigation of Structural Disorder in Normal Spinel Ferrites in Relation to Magnetic Properties — •Vitaly Zviagin1, Yogesh Kumar1, Paula Huth2, Israel Lorite1, Annette Setzer1, Daniel Spemann3, Jan Meijer1, Reinhard Denecke2, Pablo Esquinazi1, Marius Grundmann1, and Rüdiger Schmidt-Grund11Universtät Leipzig, Institut für Experimentelle Physik II, Linnéstr. 5, Germany — 2Universtät Leipzig, Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Linnéstr. 2, Germany — 3Leibniz-Institut für Oberflächenmodifizierung e. V., Permoserstr. 15, Germany

We present an optical investigation of structural disorder in spinel ferrites grown at different temperatures and pressures on MgO (100) and SrTiO3 (100) substrates by pulsed laser deposition. Optical transitions in the diagonal elements of the dielectric tensor, obtained by spectroscopic ellipsometry, were identified and related to the presence of Fe2+ and Fe3+ cations located at different lattice sites corresponding to disorder and inversion of the normal crystal structure. Procedures such as annealing and irradiation with Si ions were applied to induce disorder and to alter the crystal structure of the investigated thin films. A direct correlation between the overall magnetic response, measured by SQUID, and the presence of Fe3+ on the tetrahedral lattice sites has been found and can be explained by the ferrimagnetic order of the crystal due to the dominating nature of the oxygen mediated coupling between the tetrahedral and octahedral lattice sites.

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