Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 21: Poster I
MA 21.101: Poster
Dienstag, 13. März 2018, 09:30–13:00, Poster A
In-Operando HAXPES Band Alignment Studies Of Complex Oxide Heterostructures: Au/NiFe2O4/SrTiO3 — •Ronja Anika Heinen1, Mai H. A. Hamed1, Patrick Lömker1, Andrei Gloskovskii2, Wolfgang Drube2, and Martina Müller3 — 1Forschungszentrum Jülich GmbH, PGI-6, Jülich — 2Deutsches Elektronen-Synchrotron DESY, Hamburg — 3Technische Universität Dortmund, Experimentelle Physik I, Dortmund
Transition metal (TM) oxides exhibit a variety of physical properties due to their high tunability of spin, orbital and charge degrees of freedom. The initial way to tailor these properties is a precisely controlled growth process of single-crystalline thin film heterostructures. Thus, not only the intrinsic physical properties of the complex oxides but also the electronic conditions at the interface of functional multilayers can give raise to new paths for future applications.
In our experiments, we investigate ultrathin films of the ferrimagnetic inverse spinel NiFe2O4 (NFO) grown on the perovskite SrTiO3 (STO) substrates. We use in-operando hard X-ray photoelectron spectroscopy at a photon energy of E= 6000 eV and apply in-situ bias voltages of up to U=±8 V in order to analyse the the chemical fingerprints and simultaneously the potential barrier profile of Au/NFO/STO heterostructures. The results provide insight into the interfacial band arrangement and bias-dependent chemical reactions of ultrathin TM oxides on a microscopic scale.