X-ray magnetic circular dichroism and structural model for co-doped TiO2 (anatase) thin film

Norio Shimizu, Satoshi Sasaki, Takayasu Hanashima, Kouji Yamawaki, Hiroshi Udagawa, Naomi Kawamura, Motohiro Suzuki, Hiroshi Maruyama, Makoto Murakami, Yuji Matsumoto, Hideomi Koinuma

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

We have succeeded in measuring fluorescence X-ray magnetic circular dichroism (XMCD) and absorption spectra at the Co K absorption edge for a small amount of doped Co ions in a CoxTi1-xO2 anatase film (x = 0.07; 700-Å-thickness) on a LaAlO3 (001) substrate. X-ray fluorescence intensity was accumulated for 3 d at the pseudo-total- reflection geometry in a synchrotron undulator beamline, BL-39XU at SPring-8. Negative-to-positive dispersion-type XMCD spectra were clearly observed at E = 7.725 keV, suggesting the ferromagnetism at room temperature and unlikelihood on the existence of Co-metal clusters. XANES spectra support the Co2+ oxidation state and participation of a partial structure of ilmenite-type CoTiO3. We have proposed a crystal structure of Co-doped anatase films and the ferromagnetic order scheme by Co-Ti-O polysynthetic twin lamellae. A (012) CoTiO3 layer interstitially distributes parallel to the (001) plane of anatase and replaces a quarter of the anatase cell at intervals of three and half times of the cell along the c axis.

Original languageEnglish
Pages (from-to)800-803
Number of pages4
Journaljournal of the physical society of japan
Volume73
Issue number4
DOIs
Publication statusPublished - 2004 Apr 1
Externally publishedYes

Keywords

  • Co-doped TiO film
  • CoTiO
  • Dilute ferromagnetism
  • Ferromagnetic lamellae
  • XMCD

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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