Статья

Room-Temperature Ferromagnetism in Transparent Transition Metal-Doped Titanium Dioxide

Yuji MatsumotoCeramics Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, JapanMakoto MurakamiCeramics Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, JapanT. ShonoCeramics Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, JapanTetsuya HasegawaCeramics Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, JapanTomoteru FukumuraDepartment of Innovative and Engineered Materials, Tokyo Institute of Technology, Yokohama 226-8502, JapanM. KawasakiDepartment of Innovative and Engineered Materials, Tokyo Institute of Technology, Yokohama 226-8502, JapanParhat AhmetNational Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, JapanToyohiro ChikyowNational Institute for Research in Inorganic Materials, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, JapanShin‐ya KoshiharaDepartment of Materials Science, Tokyo Institute of Technology, 2-12-1 Okayama, Meguro-ku, Tokyo, Japan, and Kanagawa Academy of Science and Technology, KSP East Building 301, 3-2-1 Sakado, Takatsu-ku, Kawasaki-shi, Kanagawa, 213-0012, JapanHideomi KoinumaCREST-Japan Science and Technology, Waseda University, 55th Building, 3-4-1 Ohkubo, Shinjyuku-ku 169-8555, Japan

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ABI

Аннотация

Dilute magnetic semiconductors and wide gap oxide semiconductors are appealing materials for magnetooptical devices. From a combinatorial screening approach looking at the solid solubility of transition metals in titanium dioxides and of their magnetic properties, we report on the observation of transparent ferromagnetism in cobalt-doped anatase thin films with theconcentration of cobalt between 0 and 8%. Magnetic microscopy images reveal a magnetic domain structure in the films, indicating the existence of ferromagnetic long-range ordering. The materials remain ferromagnetic above room temperature with a magnetic moment of 0.32 Bohr magnetons per cobalt atom. The film is conductive and exhibits a positive magnetoresistance of 60% at 2 kelvin.

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Идентификаторы

DOI: 10.1126/science.1056186

Цитирования и источники

Цитирований: 3Использованных источников: 0

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