Dresden 2017 – scientific programme
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DS: Fachverband Dünne Schichten
DS 44: Postersession II
DS 44.14: Poster
Thursday, March 23, 2017, 17:00–19:00, P1C
Relation of sample stoichiometry and growth conditions in SrCoO3− δ thin films — •Patrick Schöffmann1, Sabine Pütter1, Jürgen Schubert2, Willi Zander2, Réne Heller3, Markus Waschk4, Paul Zakalek4, and Thomas Brückel4 — 1Jülich Centre for Neutron Science (JCNS) am Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Garching — 2Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich GmbH — 3Helmholtz-Zentrum Dresden-Rossendorf — 4Jülich 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.[1]
We aim at growing thin films of SrCoO3− δ via molecular beam epitaxy, and thus investigate the influence of growth conditions like the elemental deposition rate of Sr and Co, substrate temperature and oxygen pressure on the sample stoichiometry and surface topography.
For this, we employ in-situ electron diffraction to monitor the sample growth and ex-situ X-ray reflectometry and atomic force microscopy to investigate the structural properties. The stoichiometry is determined by Rutherford backscattering spectrometry.
We provide a comprehensive overview of the samples addressing the requirements to achieve a Sr:Co stoichiometry of 1:1.
[1]C.K. Xie et al., Appl. Phys. Lett 99, 052503 (2011)