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

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.

Identiferoai:union.ndltd.org:DRESDEN/oai:qucosa.de:bsz:15-qucosa-216180
Date14 December 2016
CreatorsStiller, Markus, Barzola-Quiquia, Jose, Esquinazi, Pablo, Spemann, Daniel, Meijer, Jan, Lorenz, Michael, Grundmann, Marius
ContributorsUniversität Leipzig, Fakultät für Physik und Geowissenschaften, AIP Publishing,
PublisherUniversitätsbibliothek Leipzig
Source SetsHochschulschriftenserver (HSSS) der SLUB Dresden
LanguageEnglish
Detected LanguageEnglish
Typedoc-type:article
Formatapplication/pdf
SourceAIP Advances 6, 125009 (2016) doi: 10.1063/1.4971794

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