Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 66: Poster 3

MA 66.16: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG2

Critical thicknesses of magneto-electronic properties in La_0.7Sr_0.3MnO₃ — •M. Wilhelm¹, T. Gerber¹, P. Lömker¹, R. Heinen¹, F. Gunkel², R. Dittmann⁶, A. Gloskovski³, W. Drube³, M. Gorgoi⁴, and M. Müller^1,5 — 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 La_0.7Sr_0.3MnO₃ (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 La_0.7Sr_0.3MnO₃ 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.