Cobalt valence states and origins of ferromagnetism in Co doped TiO 2 rutile thin films

Makoto Murakami, Yuji Matsumoto, Tetsuya Hasegawa, Parhal Ahmet, Kiyomi Nakajima, Toyohiro Chikyow, Hironori Ofuchi, Izumi Nakai, Hideomi Koinuma

Research output: Contribution to journalArticlepeer-review

68 Citations (Scopus)


The fabrication of Co doped rutile thin films on α-Al 2O3 (10-12) substrates by laser molecular beam epitaxy was discussed. It was shown that the rutile thin films were (101) oriented and have smooth surfaces with no impurity phases by using X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The contribution of oxidized (Co2+) and metallic (Co0) cobalt to the ferromagnetism was also discussed. The observed ferromagnetism was uniform and was related to the electron band structure of TiO2 rutile, according to magnetic circular dichroism studies. Characterization of Co doped rutile thin films showed that Co in rutile TiO2 takes two valence states.

Original languageEnglish
Pages (from-to)5330-5333
Number of pages4
JournalJournal of Applied Physics
Issue number10
Publication statusPublished - 2004 May 15
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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