Regensburg 2019 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 14: Poster
DS 14.18: Poster
Dienstag, 2. April 2019, 17:00–20:00, Poster E
Origin of Ferrimagnetic Properties in Disordered Spinel Ferrite Thin Films — •Vitaly Zviagin1, Paula Huth2, Chris Sturm1, Jörg Lenzner1, Annette Setzer1, 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
Spinel ferrite thin films, ZnxFe3−xO4 (0 ≤ x ≤ 1.26) and ZnFe2O4 (ZFO), were deposited on TiN/(100)MgO and (100) SrTiO3 substrates by pulsed laser deposition. The bulk as well as surface cation distribution was estimated from the relative strength of O 2p to Fe 3d and 4s electronic transitions in the dielectric function (DF) as well as analysis of Fe 3p and 2p XPS core level spectra, respectively. As the predominant cation configuration becomes less inverse with Zn increase from x = 0 to 1.26, the surface becomes less deficient (abundant) in tetrahedral (octahedral) Fe3+ occupation, as compared to the bulk. The net magnetic response was related to the antiphase boundary and inhomogeneous composition defect formation. Bulk tetrahedral Fe3+ occupation in ZFO films was found to increase with the decrease in deposition temperature and was directly correlated to the increase in net magnetic response. The change in the ferrimagnetic order in the ZFO films was related to the bulk Fe distribution and is examined as a function of deposition as well as annealing temperature and atmosphere.