Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 39: Posters II (Topological insulators; Graphene; Spintronics and spin physics; Quantum information science)

HL 39.24: Poster

Dienstag, 17. März 2015, 14:00–20:00, Poster F

(Magneto-)Optical Characterization of Sputter Deposited La_0.75Sr_0.25MnO₃ Thin Films — •Patrick Thoma¹, Manuel Monecke¹, Oana T. Ciubotariu^1,2, Roxana Dudric², Dietrich R. T. Zahn¹, and Georgeta Salvan¹ — ¹Semiconductor Physics, Technische Universität Chemnitz, D-09107 Chemnitz, Germany — ²Faculty of Physics, Babes-Bolyai University Cluj-Napoca, RO-400084 Cluj-Napoca, Romania

La_1−xSr_xMnO₃ (LSMO) is considered as a promising material for spintronic devices. Furthermore, via changing preparation conditions and/or stoichiometry of LSMO, one can tune the magnetic and transport properties¹.

LSMO with x = 0.33 has been widely investigated in this context. Here, La_0.75Sr_0.25MnO₃ thin films of different thicknesses ranging from 10 to 300 nm were grown on (111) p-doped Silicon with native SiO₂ by pulsed radio frequency magnetron sputtering at room temperature. The oxygen flow rate during the deposition process as well as the post-annealing temperature were optimized in order to obtain smooth (roughness < 1 nm) and crystalline films.

Access to the dielectric function was provided by measuring and modelling spectroscopic ellipsometry data and by recording magneto-optical Kerr effect (MOKE) spectra the off-diagonal elements of the dielectric tensor were evaluated.

¹Majumdar, S., van Dijken, S.: Pulsed laser deposition of La_1−xSr_xMnO₃: thin-film properties and spintronic applications. Journal of Physics D (2014)