Regensburg 2019 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 24: Thin Film Properties: Structure, Morphology and Composition (XRD, TEM, XPS, SIMS, RBS, AFM, ...) Part I
DS 24.7: Vortrag
Donnerstag, 4. April 2019, 16:45–17:00, H39
Spectroscopic Investigation of Disorder in 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, Leipzig — 2Universität Leipzig, Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Linnéstr. 2, Leipzig
ZnxFe3−xO4 (0 ≤ x ≤ 1.26) and ZnFe2O4 (ZFO) thin films were fabricated on TiN/(100)MgO and (100) SrTiO3 substrates by pulsed laser deposition. The bulk and surface cation distribution, determined from analysis of the spectroscopic ellipsometry as well as Fe 3p and 2p XPS core level spectra, is compared as a function of Zn (x) concentration. Antiphase boundary defect and nanocrystalline formation are related to the ferrimagnetic and superparamagnetic behavior of x = 0 and 1.26 films, respectively. The net magnetic response is related to the tetrahedral occupation by Fe3+ in the ZFO film and is correlated to the increase of O2−2p-Fe3+3d electronic transition amplitude in the dielectric function (DF) spectra with the decrease in substrate temperature.[1] ZFO films, grown at low and high oxygen pressure, were annealed at temperatures 250 - 375 ∘C in oxygen and argon atmospheres, respectively. The defect type and concentration was found to decrease as the cations are redistributed with the increase in annealing temperature in both environments, evident from the strength of DF electronic transitions as well as net magnetic moment.
[1] V. Zviagin et al., Appl. Phys. Lett. 108, 13 (2016)