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

研究成果: Letter査読

59 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)L105-L107
ジャーナルJapanese Journal of Applied Physics, Part 2: Letters
42
2 A
DOI
出版ステータスPublished - 2003 2月 1

ASJC Scopus subject areas

  • 工学(全般)
  • 物理学および天文学(全般)

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