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Berlin 2018 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 31: Poster Session II

DS 31.1: Poster

Donnerstag, 15. März 2018, 11:15–13:15, Poster F

Morphology and crystallinity of SrxCoyOz films at different growth conditions and stoichiometry — •Patrick Schöffmann1, Sabine Pütter1, Jürgen Schubert2, Willi Zander2, Markus Waschk3, Paul Zakalek3, and Thomas Brückel31Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Garching — 2Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich GmbH — 3Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH

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]

We aim at growing thin films of SrCoO3− δ by molecular beam epitaxy and filling the oxygen vacancies by oxygen plasma assisted annealing. Achieving a 1:1 stoichiometry by co-evaporation of Sr and Co requires tuning of the individual growth rates, which is not straightforward as there are three constituents with different sticking coefficients.

We present the effect of the growth conditions on the stoichiometry, crystallinity and morphology of SrxCoyOz films on STO and requirements for Sr1Co1O2.5 films. First results of decreased oxygen vacancies by annealing in a low pressure oxygen atmosphere are discussed.

[1] H. Jeen et al., Nature Materials 12, 2013

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