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Origin of the ferromagnetism in defective TiO2 single crystals

Zhou, S.; Cizmar, E.; Potzger, K.; Krause, M.; Talut, G.; Helm, M.; Fassbender, J.; Zvyagin, S. A.; Wosnitza, J.; Schmidt, H.

In this paper we show that ferromagnetism can be induced in pure TiO2 single crystals by oxygen ion irradiation. By combining x-ray diffraction, Raman-scattering, and electron spin resonance spectroscopy, a defect complex, Ti^{3+} ions on the substitutional sites accompanied by oxygen vacancies, has been identified in irradiated TiO2. This kind of defect complex results in a lattice strain and a local (TiO_{6-x}) stretching Raman mode. We elucidate that Ti^{3+} ions with one unpaired 3d electron provide the local magnetic moments.

Keywords: TiO2; Induced ferromagnetism; Defects; ESR

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Permalink: https://www.hzdr.de/publications/Publ-11876
Publ.-Id: 11876