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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.