Ferromagnetism of cobalt-doped anatase TiO 2 studied by bulk- and surface-sensitive soft x-ray magnetic circular dichroism

V. R. Singh, K. Ishigami, V. K. Verma, G. Shibata, Y. Yamazaki, T. Kataoka, A. Fujimori, F. H. Chang, D. J. Huang, H. J. Lin, C. T. Chen, Y. Yamada, T. Fukumura, M. Kawasaki

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23 Citations (Scopus)

Abstract

We have studied magnetism in anatase Ti 1-xCo xO 2-δ (x = 0.05) thin films with various electron carrier densities, by soft x-ray magnetic circular dichroism (XMCD) measurements at the Co L 2,3 absorption edges. For electrically conducting samples, the magnetic moment estimated by XMCD was < 0.3 μ B/Co using the surface-sensitive total electron yield mode, while it was 0.3-2.4 μ B/Co using the bulk-sensitive total fluorescence yield mode. The latter value is in the same range as the saturation magnetization 0.6-2.1 μ B/Co deduced by SQUID measurement. The magnetization and the XMCD intensity increased with carrier density, consistent with the carrier-induced origin of the ferromagnetism.

Original languageEnglish
Article number242404
JournalApplied Physics Letters
Volume100
Issue number24
DOIs
Publication statusPublished - 2012 Jun 11
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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