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MA: Fachverband Magnetismus
MA 66: Poster 3
MA 66.16: Poster
Friday, March 24, 2017, 09:30–13:00, P2-OG2
Critical thicknesses of magneto-electronic properties in La0.7Sr0.3MnO3 — •M. Wilhelm1, T. Gerber1, P. Lömker1, R. Heinen1, F. Gunkel2, R. Dittmann6, A. Gloskovski3, W. Drube3, M. Gorgoi4, and M. Müller1,5 — 1Forschungszentrum Jülich GmbH, Peter Grünberg Institut, PGI-6 — 2IWE2, RWTH Aachen University — 3DESY Photon Science, Hamburg — 4HZB, BESSY II, Berlin — 5Fakultät für Physik, and CENIDE, Universität Duisburg-Essen — 6Forschungszentrum Jülich GmbH, Peter Grünberg Institut, PGI-7
Transition metal oxides, like perovskite manganites, are extensively investigated due to their richness of underlying physics and potential technological applications. Special attention is paid to the half-metallic ferromagnetic oxide La0.7Sr0.3MnO3 (LSMO), due to its high spin polarization (∼ 95 %) and the high Curie temperature (370K), which makes it a promising candidate for room temperature spintronic applications. We have investigated the structural, magnetic and electronic properties of heteroepitaxially grown La0.7Sr0.3MnO3 thin films on a SrTiO3 (001) substrate by means of XRD, VSM and HAXPES, respectively. In particular, we have performed a detailed study on the thickness-property relationship, in which the LSMO film thickness was gradually reduced from 20 nm (bulk) down to the ultra-thin film regime of 0.8 nm. We observe a critical thickness between 0.8 -1.2 nm, which is completely nonferromagnetic as well as nonmetallic. Further, we have estimated a metal-insulator transition occurring at ∼3 nm.