Hydrogen Annealing Induced the Enhancement of Ferromagnetism in Cr-Doped TiO2 Anatase Films
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概要
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Polycrystalline Cr-doped TiO2 (Cr0.05Ti0.95O2) anatase films have been prepared on Si(001) substrates by sol–gel method. The Cr0.05Ti0.95O2 anatase film annealed in air ambient shows weak ferromagnetism with a magnetic moment of 0.026 $\mu_{\text{B}}$/Cr in a field of 3000 Oe at room temperature. After further annealed in a hydrogen atmosphere, the ferromagnetic response in the Cr0.05Ti0.95O2 anatase film is significantly enhanced, reaching a magnetic moment of 0.234 $\mu_{\text{B}}$/Cr. X-ray diffraction (XRD) fails to detect the existence of second phases such as Cr or CrO2 in Cr0.05Ti0.95O2 films. X-ray photoelectron spectroscopy (XPS) study shows that Ti is in +4 valence state and Cr in +3 valence state. Oxygen vacancies are created in the Cr0.05Ti0.95O2 film after hydrogenation, suggested by the XPS measurement. These results suggest that oxygen vacancies created by hydrogen annealing play a role on ferromagnetism in the Cr-doped TiO2 anatase films.
- 2008-12-25
著者
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Zhang Xing
Institute Of Advanced Material Study Kyushu University
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Han Ruqi
Institute Of Microelectronics Peking University
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Wang Yi
Institute For Horticultural Plants China Agricultural University
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Zhang Xing
Institute of Microelectronics, Peking University, Beijing 100871, China
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Liu Lifeng
Institute of Microelectronics, Peking University, Beijing 100871, China
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Kang Jinfeng
Institute of Microelectronics, Peking University and Key Laboratory of Microelectronic Devices and Circuits, Ministry of Education, No. 5 Yiheyuan Road, Haidian District, Beijing 100871, P. R. China
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Wang Yi
Institute of Microelectronics, Peking University, Beijing 100871, China
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