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Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 47: Magnetic anisotropy in thin films

MA 47.1: Vortrag

Donnerstag, 4. April 2019, 11:30–11:45, H53

X-ray magnetic circular dichroism on undoped TiO2 anatase magnetic thin films with out-of-plane anisotropy — •Markus Stiller1, José Barzola-Quiquia1, Pablo D. Esquinazi1, Angelika Chassé2, Martin Trautmann2, Alpha T. N’Diaye3, Hendrik Ohldag4, Thomas Lautenschläger5, Daniel Spemann5, Michael Lorenz1, and Marius Grundmann11Felix-Bloch Institute for Solid-state Physics, Universität Leipzig, Linnestr. 5, D-04103, Germany — 2Institut für Physik, Martin-Luther-Universität Halle-Wittenberg Von-Seckendorff-Platz 1, 06120 Halle — 3Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States — 4SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California, 94025 USA — 5Leibniz-Institut für Oberflächenmodifizierung e.V., Permoserstraße 15, 04318 Leipzig, Germany

Epitaxial, polycrystalline and undoped TiO2 anatase thin films were grown on LAO and STO substrates and irradiated with low energy argon ions (200eV). Field hysteresis as well as zero-field cooled and field cooled curves reveal that, after irradiation the samples show ferromagnetism at room temperature with an out-of-plane easy axis. XMCD measurements show that the band at the titanium L-edges is spin polarized, not at the O K-edge as is the case in ZnO. MultiX simulations can depict the experimental data and indicate that the magnetization is due to titanium di-Frenkel pairs. With electron beam lithography we prepared magnetic patterns of the anatase thin film measured with magnetic force microscopy.

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