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Ferromagnetism induced by clustered Co in Co-doped anatase TiO2 thin films.

Authors
  • Kim, J-Y
  • Park, J-H
  • Park, B-G
  • Noh, H-J
  • Oh, S-J
  • Yang, J S
  • Kim, D-H
  • Bu, S D
  • Noh, T-W
  • Lin, H-J
  • Hsieh, H-H
  • Chen, C T
Type
Published Article
Journal
Physical review letters
Publication Date
Jan 10, 2003
Volume
90
Issue
1
Pages
17401–17401
Identifiers
PMID: 12570648
Source
Medline
License
Unknown

Abstract

We investigated ferromagnetism of a newly discovered ferromagnetic semiconductor Co-doped anatase TiO2 thin film, using the magnetic circular dichroism (MCD) at the Co L(2,3) absorption edges. The magnetic moment was observed to be approximately 0.1 micro(B)/Co in the measurements, but the MCD spectral line shape is nearly identical to that of Co metal, showing that the ferromagnetism is induced by a small amount of clustered Co. With thermal treatments at approximately 400 degrees C, the MCD signal increases, and the moment reaches up to approximately 1.55 micro(B)/Co, which is approximately 90% of the moment in Co metal. In the latter case, the cluster size was observed to be 20-60 nm.

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