Origin of magnetic moments in defective TiO 2 single crystals

By Shengqiang Zhou, E. Čižmár, K. Potzger, M. Krause, G. Talut, M. Helm, J. Fassbender, S. Zvyagin, J. Wosnitza, H. Schmidt. 2009

162 citations recorded by the source corpus.

In this Brief Report we show that ferromagnetism can be induced in pure ${\text{TiO}}_{2}$ single crystals by oxygen ion irradiation. By combining x-ray diffraction, Raman scattering, and electron-spin resonance spectroscopy, a defect complex, i.e., ${\text{Ti}}^{3+}$ ions on the substitutional sites accompanied by oxygen vacancies, has been identified in irradiated ${\text{TiO}}_{2}$. This kind of defect complex results in a local $({\text{TiO}}_{6\ensuremath{-}x})$ stretching Raman mode. We elucidate that ${\text{Ti}}^{3+}$ ions with one unpaired $3d$ electron provide the local magnetic moments.

Subfields: Condensed Matter Physics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/6c1942053185e9b4ee864c1468c630e45fc22e99