Strong out-of-plane magnetic anisotropy in ion irradiated anatase TiO2 thin films

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Date
2016
Volume
6
Issue
12
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Publisher
New York, NY : American Inst. of Physics
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Abstract

The temperature and field dependence of the magnetization of epitaxial, undoped anatase TiO2 thin films on SrTiO3 substrates was investigated. Low-energy ion irradiation was used to modify the surface of the films within a few nanometers, yet with high enough energy to produce oxygen and titanium vacancies. The as-prepared thin film shows ferromagnetism which increases after irradiation with low-energy ions. An optimal and clear magnetic anisotropy was observed after the first irradiation, opposite to the expected form anisotropy. Taking into account the experimental parameters, titanium vacancies as di-Frenkel pairs appear to be responsible for the enhanced ferromagnetism and the strong anisotropy observed in our films. The magnetic impurities concentrations was measured by particle-induced X-ray emission with ppm resolution. They are ruled out as a source of the observed ferromagnetism before and after irradiation.

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Keywords
Ferromagnetism, Impurities, Ion beams, Ion bombardment, Ions, Magnetic anisotropy, Strontium titanates, Titanium, Titanium dioxide, Experimental parameters, Field dependence, Low-energy ion irradiation, Magnetic impurity, Out-of-plane magnetic anisotropy, Particle induced X-ray emission, SrTiO3 substrates, Strong anisotropy, Thin films
Citation
Stiller, M., Barzola-Quiquia, J., Esquinazi, P., Spemann, D., Meijer, J., Lorenz, M., & Grundmann, M. (2016). Strong out-of-plane magnetic anisotropy in ion irradiated anatase TiO2 thin films. 6(12). https://doi.org//10.1063/1.4971794
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CC BY 4.0 Unported