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

Markus Stiller | Zendy; J. BarzolaQuiquia | Zendy; P. Esquinazi | Zendy; D. Spemann | Zendy; Jan Meijer | Zendy; Michael Lorenz | Zendy; Marius Grundmann | Zendy

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

Author(s) -

Markus Stiller,

J. BarzolaQuiquia,

P. Esquinazi,

D. Spemann,

Jan Meijer,

Michael Lorenz,

Marius Grundmann

Publication year - 2016

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4971794

Subject(s) - ferromagnetism , anatase , materials science , irradiation , thin film , magnetization , anisotropy , condensed matter physics , ion , magnetic anisotropy , impurity , film plane , titanium , magnetic field , chemistry , nanotechnology , optics , physics , metallurgy , catalysis , biochemistry , organic chemistry , photocatalysis , quantum mechanics , nuclear physics

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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