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MA: Fachverband Magnetismus

MA 27: Half-metals and Oxides (jointly with TT)

MA 27.4: Vortrag

Mittwoch, 28. März 2012, 10:15–10:30, EB 202

Magnetic characterization of ferromagnetic LSMO layers on STO grown by different methods — •Martin Wahler¹, Christian Eisenschmidt¹, Nico Homonnay¹, Ionela Vrejoiu², Alek Dediu³, Vasily Moshnyaga⁴, and Georg Schmidt¹ — ¹Institute of Physics, Martin-Luther-Universität Halle-Wittenberg, von-Danckelmann-Platz 3, 06120 Halle, Germany — ²Max Planck Institute of Microstructure Physics, 06120 Halle, Germany — ³Institute of Nanostructured Materials, ISMN-CNR, 40129 Bologna, Italy — ⁴I. Physikalisches Institut, Friedrich-August-Universität Göttingen, 37077 Göttingen, Germany

La_xSr_(1−x)MnO₃ is widely used as a ferromagnetic electrode for example in organic spintronics. Its epitaxial thin films are well established in oxide heterostructures. For best performance in spintronics applications it is necessary to deposit layers with perfect crystallinity and good control of ferromagnetism and anisotropy. We have investigated LSMO thin films deposited on Strontiumtitanate by various methods namely pulsed laser deposition (PLD), pulsed plasma deposition (PPD) and metalorganic aerosol deposition (MAD). All samples show high crystalline quality as confirmed by X-ray diffractometry and reflectometry. SQUID magnetometry shows that in saturation the layers deposited by PLD and PPD yield similar magnetization values, while the value obtained from MAD samples is higher. Curie temperatures range from 280 K for PPD to > 300 K for PLD and MAD grown samples. The anisotropy as determined by ferromagnetic resonance is uniaxial in plane at room and biaxial at lower temperatures.