Room-temperature ferromagnetism in transparent transition metal-doped titanium dioxide |
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Authors: | Matsumoto Y Murakami M Shono T Hasegawa T Fukumura T Kawasaki M Ahmet P Chikyow T Koshihara S Koinuma H |
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Affiliation: | Ceramics Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan. |
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Abstract: | 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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