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MA: Fachverband Magnetismus
MA 15: Magnetic Thin Films II
MA 15.2: Vortrag
Dienstag, 8. März 2016, 09:45–10:00, H33
The influence of low-energy proton irradiation on the magnetic properties of undoped TiO2 anatase thin films — •Markus Stiller1, José Barzola-Quiquia1, Pablo Esquinazi1, Daniel Spemann2, Jan Meijer2, Michael Lorenz3, and Marius Grundmann3 — 1Abteilung für Supraleitung und Magnetismus, Fakultät für Physik und Geowissenschaften, Universität Leipzig, Linnestr. 5, D-04103, Germany — 2Abteilung Nukleare Festkörperphysik, Fakultät für Physik und Geowissenschaften, Universität Leipzig, Linnestr. 5, D-04103, Germany — 3Abteilung Halbleiterphysik, Fakultät für Physik und Geowissenschaften, Universität Leipzig, Linnestr. 5, D-04103, Germany
The temperature and field dependence of the magnetization of epitaxial, undoped TiO2 anatase thin films on sapphire substrates was investigated. Field hysteresis as well as zero-field cooled and field cooled curves were measured for the as-prepared thin films as well as after irradiation of low-energy protons. The anatase thin films exhibit ferromagnetism after proton irradiation, which strength does not increase linearly with the amount of irradiated protons. A clear magnetic anisotropy, opposite to the expected one, was observed after the first irradiation. The presence of impurities (with ppm resolution) was investigated by means of particle-induced X-ray emission. The experimental results indicate that Ti vacancies are the origin for the observed magnetic order.