Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 66: Magnetic Heusler Materials, Semimetals und Oxides
(Joint session of MA and TT organized by MA)

TT 66.6: Vortrag

Donnerstag, 10. März 2016, 11:00–11:15, H34

Thermodynamic Stability and Control of Oxygen Reactivity at Magnetic Oxide Interfaces: EuO on ITO — •Timm Gerber¹, Patrick Lömker¹, Bernardus Zijlstra¹, Claire Besson², David Müller¹, Willi Zander³, Jürgen Schubert³, Mihaela Gorgoi⁴, and Martina Müller^1,5 — ¹Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich, Jülich, Germany — ²Institut für Anorganische Chemie, RWTH Aachen University, Germany — ³Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich, Jülich, Germany — ⁴Helmholtz-Zentrum für Materalien und Energie GmbH, Berlin, Germany — ⁵Fakultät für Physik, Universität Duisburg-Essen, Duisburg, Germany

As a prototypical all-oxide heterostructure, the ferromagnetic insulator europium monoxide (EuO) is synthesized on transparent and conductive indium tin oxide (ITO) virtual substrates. Non-destructive hard X-ray photoelectron spectroscopy (HAXPES) is employed to depth profile the chemical composition of the magnetic layer and the buried oxide-oxide interface. We find that the otherwise well-established adsorption-controlled EuO growth mode is not applicable here due to thermally activated oxygen diffusion from ITO. We present how to control the oxygen reactivity at the interface and discuss its origin in a thermodynamic analysis. Our complementary methodical strategy allows for a significant improvement of ultrathin EuO films with sizeable magnetic properties. Generally, our approach derives guidelines for the proper choice of oxide substrates and buffer layer materials for functional all-oxide heterostructures.