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Defect types and room temperature ferromagnetism in N-doped rutile TiO2single crystals
作者姓名:秦秀波  李东翔  李瑞琴  张鹏  李玉晓  王宝义
基金项目:supported by the Young Scientists Fund of the National Natural Science Foundation of China(Grant No.61006066)
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.

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
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.
Keywords:N doping  titanium vacancies  replacement of O with N atoms  ferromagnetism
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