Regensburg 2019 – scientific programme
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DS: Fachverband Dünne Schichten
DS 25: Thin Film Properties: Structure, Morphology and Composition (XRD, TEM, XPS, SIMS, RBS, AFM, ...) Part II
DS 25.9: Talk
Friday, April 5, 2019, 11:45–12:00, H32
Topotactic transition mechanisms in SrCoO2.5+x films — •Patrick Schöffmann1, Sabine Pütter1, Anirban Sarkar2, Amir Syed-Mohd1, Markus Waschk2, Tanvi Bhatnagar2, Paul Zakalek2, and Thomas Brückel2 — 1Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Garching, Germany — 2Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Jülich, Germany
Strontium cobaltite (SrCoO3− δ) exists in two topotactic phases, depending on the oxygen content. SrCoO3 is a ferromagnetic metal (TC=305K) with perovskite structure while SrCoO2.5 is an antiferromagnetic insulator(TN=570K) with brownmillerite structure. Because of the multivalent Co states and high oxygen mobility it is a promising material for energy and information applications [1]. To control the oxygen content, several possibilites exist. We focus on annealing in oxidising conditions and applying variable strain with a piezoelectric substrate to the film.
We grow thin films of SrCoO2.5 by molecular beam epitaxy on various substrates including a piezoelectric with a conducting buffer layer.
To be able to transfer strain from the substrate to the film, a high sample quality and epitaxy is mandatory, thus we present the results of the film growth and quality, as well as first results of the magnetic characterisation by SQUID and neutron reflectometry.
[1] H. Jeen et al., Nature Materials 12, 2013