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DS: Fachverband Dünne Schichten

DS 17: Poster Session I

DS 17.15: Poster

Dienstag, 13. März 2018, 18:15–20:15, Poster B

Optical and Magnetic Properties of Spinel Type Ferrites in Relation to their Crystallographic Order — •Vitaly Zviagin¹, Paula Huth², Chris Sturm¹, Daniel Spemann³, Stephan Mändl³, Jörg Lenzner¹, Annette Setzer¹, Jan Meijer¹, Reinhard Denecke², Pablo Esquinazi¹, Marius Grundmann¹, and Rüdiger Schmidt-Grund¹ — ¹Universität Leipzig, Felix-Bloch-Institut für Festkörperphysik, Linnéstr. 5, Germany — ²Universität Leipzig, Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Linnéstr. 2, Leipzig — ³Leibniz-Institut für Oberflächenmodifizierung e. V., Permoserstr. 15, Leipzig

ZnFe₂O₄ (ZFO) and composite Zn_xFe_3−xO₄ thin films were fabricated on SrTiO₃ (100) and TiN/MgO (100) substrates by pulsed laser deposition. Assigned electronic transitions in the dielectric function show a clear dependence on temperature as well as pressure during deposition and annealing processes. A decrease in the octahedral Fe²⁺ site occupancy with an increase in Zn concentration in composite films was observed in the band to band transition as well as the valence specific elemental composition, determined by spectroscopic ellipsometry and analysis of Fe 3p and 2p XPS core levels, respectively. Change in the ferrimagnetic response and electronic structure was examined after annealing ZFO films in argon and oxygen atmospheres at different temperatures as well as after irradiation by Ne⁺ ions with different fluences. Along with complementary methods such as Raman, AFM and SEM, we show the influence of crystallographic order on magnetic properties of normal, disordered and inverse spinel ferrite thin films.