Magneto-Optical Spectroscopy of Anatase TiO2 Doped with Co

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概要

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• 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 ${\sim}10400$ 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.

• INSTITUTE OF PURE AND APPLIED PHYSICSの論文
• 2003-02-01

著者

• Yamada Yasuhiro

  Institute Of Materials Research Tohoku University

• Fuke Shunro

  Department Of Electrical & Electronic Engineering Shizuoka University

• NAKAJIMA Kiyomi

  National Institute for Mateirals Science

• Segawa Yusaburo

  Photodynamics Research Center Frontier Research Program The Institute Of Physical And Chemical Resea

• Koinuma Hideomi

  Materials And Structures Labolatory Tokyo Institute Of Technology

• Tamura Kentaro

  Institute For Global Environmental Strategies

• Hasegawa Tetsuya

  Frontier Collaborative Research Center Tokyo Institute Of Technology

• Tsukazaki Atsushi

  Institute For Materials Research (imr) Tohoku University

• Aoyama Toyomi

  Materials And Structures Labolatory Tokyo Institute Of Technology

• Sumiya Masatomo

  Department Of Electrical & Electronic Engineering Shizuoka University

• Chikyow Toyohiro

  National Inst. Materials Sci. Ibaraki Jpn

• Kawasaki Masashi

  Institute For Chemical Research Kyoto University

• FUKUMURA Tomoteru

  Institute for Materials Research

• Tsukazaki Atsushi

  Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan

• Aoyama Toyomi

  Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan

• Sumiya Masatomo

  Department of Electrical and Electronic Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu 432-8561, Japan

• Koinuma Hideomi

  Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan

• Segawa Yusaburo

  Photodynamics Research Center, RIKEN, 519-1399 Aoba, Aramaki, Aoba-ku, Sendai 980-0845, Japan

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