| Magnetic and Optical Properties of the TiO2-Co-TiO2 Composite Films Grown by Magnetron Sputtering |
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| 作者姓名： | LIU Fa-min DING Peng SHI Wei-mei WANG Tian-min |
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| 作者单位： | LIU Fa-min，DING Peng，SHI Wei-mei，WANG Tian-min Department of Physics，School of Sciences，Beijing University of Aeronautics and Astronautics，Beijing 100083，China |
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| 基金项目： | 中国航空科学基金
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Items of Engineering Research Institute, Peking University |
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| 摘 要： | The TiO2-Co-TiO2 sandwich films were successfully grown on glass and silicon substrata making alternate use of radio frequency reactive magnetron sputtering and direct current magnetron sputtering. The structures and properties of these films were identified with X-ray diffraction (XRD), Raman spectra and X-ray photoemission spectra (XPS). It is shown that the sandwich film consists of two anatase TiO2 films with an embedded Co nano-film. The fact that, when the Co nano-film thickens, varied red shifts appear in optical absorption spectra may well be explained by the quantum confinement and tunnel effects. As for magnetic properties, the saturation magnetization, remnant magnetic induction and coercivity vary with the thickness of the Co nano-films. Moreover, the Co nano-film has a critical thickness of about 8.6 nm, which makes the coercivity of the composite film reach the maximum of about 1413 Oe.
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| 关 键 词： | 磁控管 反应溅射法 表面结构 氧化钛 |
| 收稿时间： | 10 August 2006 |
| 修稿时间： | 2006-08-10 |
Magnetic and Optical Properties of the TiO2-Co-TiO2 Composite Films Grown by Magnetron Sputtering |
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| LIU Fa-min DING Peng SHI Wei-mei WANG Tian-min.Magnetic and Optical Properties of the TiO2-Co-TiO2 Composite Films Grown by Magnetron Sputtering[J].Chinese Journal of Aeronautics,2007,20(2):162-167. |
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| Authors: | LIU Fa-min DING Peng SHI Wei-mei WANG Tian-min |
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| Institution: | Department of Physics, School of Sciences, Beijing University of Aeronautics and Astronautics, Beijing 100083, China |
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| Abstract: | The TiO2-Co-TiO2 sandwich films were successfully grown on glass and silicon substrata making alternate use of radio frequency reactive magnetron sputtering and direct current magnetron sputtering. The structures and properties of these films were identified with X-ray diffraction (XRD), Raman spectra and X-ray photoemission spectra (XPS). It is shown that the sandwich film consists of two anatase TiO2 films with an embedded Co nano-film. The fact that, when the Co nano-film thickens, varied red shifts appear in optical absorption spectra may well be explained by the quantum confinement and tunnel effects. As for magnetic properties, the saturation magnetization, remnant magnetic induction and coercivity vary with the thickness of the Co nano-films. Moreover, the Co nano-film has a critical thickness of about 8.6 nm, which makes the coercivity of the composite film reach the maximum of about 1413 Oe. |
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| Keywords: | TiO2-Co-TiO2 sandwich films surface structure and properties optical and magnetic properties Magnetron Sputtering Composite Films Optical Properties composite film reach maximum critical remnant magnetic induction coercivity thickness saturation magnetization magnetic properties appear optical absorption spectra quantum confinement tunnel effects fact |
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