Magneto-optical spectroscopy of anatase TiO2 doped with Co

Tomoteru Fukumura, Yasuhiro Yamada, Kentaro Tamura, Kiyomi Nakajima, Toyomi Aoyama, Atsushi Tsukazaki, Masatomo Sumiya, Shunro Fuke, Yusaburo Segawa, Toyohiro Chikyow, Tetsuya Hasegawa, Hideomi Koinuma, Masashi Kawasaki

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60 Citations (Scopus)


Magneto-optical spectroscopy of a transparent ferromagnetic semiconductor, anatase TiO2 doped with Co, is carried out at room temperature. A large magneto-optical response with ferromagnetic field dependence is observed throughout from ultraviolet to visible range and increases with increasing Co content or carrier concentration. The magnitude of magnetic circular dichroism (MCD) per unit thickness has a peak around the absorption edge such a huge value of ∼10400 deg/cm at 3.57 eV for a 10 mol% Co-doped specimen. Although the results are not sufficient to prove that the ferromagnetism is in the ordinary framework of diluted magnetic semiconductors, the coexistence of Co impurity and mobile carrier is shown to transform the band structure of host TiO2 to generate ferromagnetism.

Original languageEnglish
Pages (from-to)L105-L107
JournalJapanese Journal of Applied Physics
Issue number2 A
Publication statusPublished - 2003 Feb 1


  • Anatase TiO
  • Co
  • Ferromagnetism
  • Laser molecular beam epitaxy
  • Magnetic semiconductor
  • Magneto-optical effect
  • Oxide
  • Thin film


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