Negligible magnetism in excellent structural quality CrxTi1-xO2 anatase: Contrast with high-TC ferromagnetism in structurally defective CrxTi1-xO2

T. C. Kaspar, S. M. Heald, C. M. Wang, J. D. Bryan, T. Droubay, V. Shutthanandan, S. Thevuthasan, D. E. McCready, A. J. Kellock, D. R. Gamelin, S. A. Chambers

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Abstract

We reexamine the mechanism of ferromagnetism in doped TiO2 anatase, using epitaxial Cr: TiO2 with excellent structural quality as a model system. In contrast to highly oriented but defective Cr: TiO2 (∼0.5μB/Cr), these structurally superior single crystal films exhibit negligible ferromagnetism. Similar results were obtained for Co: TiO2. We show for the first time that charge-compensating oxygen vacancies alone, as predicted by F-center mediated exchange, are not sufficient to activate ferromagnetism. Instead, the onset of ferromagnetism correlates with the presence of structural defects.

Original languageEnglish
Article number217203
JournalPhysical Review Letters
Volume95
Issue number21
DOIs
Publication statusPublished - 18 Nov 2005
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Kaspar, T. C., Heald, S. M., Wang, C. M., Bryan, J. D., Droubay, T., Shutthanandan, V., Thevuthasan, S., McCready, D. E., Kellock, A. J., Gamelin, D. R., & Chambers, S. A. (2005). Negligible magnetism in excellent structural quality CrxTi1-xO2 anatase: Contrast with high-TC ferromagnetism in structurally defective CrxTi1-xO2. Physical Review Letters, 95(21), [217203]. https://doi.org/10.1103/PhysRevLett.95.217203