中国物理B ›› 2014, Vol. 23 ›› Issue (6): 67502-067502.doi: 10.1088/1674-1056/23/6/067502

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Defect types and room temperature ferromagnetism in N-doped rutile TiO2 single crystals

秦秀波a d, 李东翔b, 李瑞琴b, 张鹏a, 李玉晓c, 王宝义a   

  1. a Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;
    b School of Mathematics and Physics, Anshun University, Anshun 561000, China;
    c School of Physical Engineering, Zhengzhou University, Zhengzhou 450001, China;
    d Division for Nuclear Technology and Application, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2013-07-29 修回日期:2013-12-03 出版日期:2014-06-15 发布日期:2014-06-15
  • 基金资助:
    Project supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 61006066).

Defect types and room temperature ferromagnetism in N-doped rutile TiO2 single crystals

Qin Xiu-Bo (秦秀波)a d, Li Dong-Xiang (李东翔)b, Li Rui-Qin (李瑞琴)b, Zhang Peng (张鹏)a, Li Yu-Xiao (李玉晓)c, Wang Bao-Yi (王宝义)a   

  1. a Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;
    b School of Mathematics and Physics, Anshun University, Anshun 561000, China;
    c School of Physical Engineering, Zhengzhou University, Zhengzhou 450001, China;
    d Division for Nuclear Technology and Application, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • Received:2013-07-29 Revised:2013-12-03 Online:2014-06-15 Published:2014-06-15
  • Contact: Qin Xiu-Bo E-mail:qinxb@ihep.ac.cn
  • Supported by:
    Project 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 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.

关键词: N doping, titanium vacancies, replacement of O with N atoms, ferromagnetism

Abstract: 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 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.

Key words: N doping, titanium vacancies, replacement of O with N atoms, ferromagnetism

中图分类号:  (Magnetic semiconductors)

  • 75.50.Pp
71.55.-i (Impurity and defect levels) 75.20.Hr (Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions)