Defect types and room temperature ferromagnetism in N-doped rutile TiO2single crystals |
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作者姓名: | 秦秀波 李东翔 李瑞琴 张鹏 李玉晓 王宝义 |
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基金项目: | supported by the Young Scientists Fund of the National Natural Science Foundation of China(Grant No.61006066) |
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摘 要: | The magnetic properties and defect types of virgin and N-doped TiO2 single crystals are probed by superconducting quantum interference device (SQUID), X-ray photoelectron spectroscopy (XPS), and positron annihilation analysis (PAS). Upon N doping, a twofold enhancement of the saturation magnetization is observed. Apparently, this enhancement is not related to an increase in oxygen vacancy, rather to unpaired 3d electrons in Ti3+, arising from titanium vacancies and the replacement of O with N atoms in the futile structure. The production of titanium vacancies can enhance the room temperature ferromagnetism (RTFM), and substitution of O with N is the onset of ferromagnetism by inducing relatively strong ferromagnetic ordering.
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关 键 词: | 金红石型TiO2 缺陷类型 铁磁性 N掺杂 单晶 室温 超导量子干涉器件 X射线光电子能谱 |
Defect types and room temperature ferromagnetism in N-doped rutile TiO_2 single crystals |
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Abstract: | The magnetic properties and defect types of virgin and N-doped TiO2single crystals are probed by superconducting quantum interference device(SQUID), X-ray photoelectron spectroscopy(XPS), and positron annihilation analysis(PAS).Upon N doping, a twofold enhancement of the saturation magnetization is observed. Apparently, this enhancement is not related to an increase in oxygen vacancy, rather to unpaired 3d electrons in Ti3+, arising from titanium vacancies and the replacement of O with N atoms in the rutile structure. The production of titanium vacancies can enhance the room temperature ferromagnetism(RTFM), and substitution of O with N is the onset of ferromagnetism by inducing relatively strong ferromagnetic ordering. |
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Keywords: | N doping titanium vacancies replacement of O with N atoms ferromagnetism |
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