Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 26: Thin films – coupling effects
MA 26.1: Vortrag
Mittwoch, 14. März 2018, 09:30–09:45, EB 301
Influence of oxygen content on magnetic properties in La2/3Sr1/3MnO3-δ thin films — •Lei Cao1, Oleg Petracic1, Alexander Weber1,2, Paul Zakalek1, and Thomas Brückel1,2 — 1Jülich Centre for Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, Jülich — 2Jülich Centre for Neutron Science JCNS at Heinz Maier-Leibnitz Zentrum MLZ, Forschungszentrum Jülich GmbH, Garching
Complex oxides display a multitude of unique phenomena, such as various forms of magnetism, superconductivity, colossal magnetoresistance, and couplings between these states. The role of oxygen content after sample preparation onto the physical properties is mostly unknown. The ability to control the oxygen composition after the preparation may provide the possibility to dynamically tune the physical properties and establish a comprehensive understanding of the structure-property relationship. We report on the fabrication of La0.7Sr0.3MnO3-δ thin films on SrTiO3 substrates by high oxygen pressure sputtering. Using an in-situ x-ray diffraction setup we investigate the crystallographic properties while annealing the samples in vacuum and at various temperatures. While annealing induces a desorption of oxygen, absorption of oxygen is realized in a controlled oxygen plasma of a sputtering setup. By employing magnetometry and electrical resistivity measurements, we study the magnetic and transport properties of the as-prepared, annealed and plasma treated systems. We then relate the influence of oxygen absorption/desorption to the physical properties of the films.