Origin of magnetic moments in defective TiO2 single crystals

Details Origin of magnetic moments in defective TiO2 single crystals Origin of magnetic moments in defective TiO2 single crystals

2009-02-12

arxiv.org/abs/0902.2092v1

Phys. Rev. B 79, 113202 (2009)

Physics

Condensed Matter

Materials Science

4 pages, 4 figures, to be published at Phys. Rev. B

Scientific paper

10.1103/PhysRevB.79.113201

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, \emph{i.e.} 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 local (TiO$_{6-x}$) stretching Raman mode. We elucidate that Ti$^{3+}$ ions with one unpaired 3d electron provide the local magnetic moments.

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