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

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 magnetizatio...

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Published in中国物理B：英文版 no. 6; pp. 519 - 523
Main Author 秦秀波 李东翔 李瑞琴 张鹏 李玉晓 王宝义
Format Journal Article
LanguageEnglish
Published 01.06.2014
Subjects
N掺杂
X射线光电子能谱
单晶
室温
缺陷类型
超导量子干涉器件
金红石型TiO2
铁磁性
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ISSN1674-1056
2058-3834
DOI10.1088/1674-1056/23/6/067502

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Summary: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.
Bibliography:Qin Xiu-Bo, Li Dong-Xiang, Li Rui-Qin, Zhang Peng, Li Yu-Xiao, Wang Bao-Yi（ 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
N doping, titanium vacancies, replacement of 0 with N atoms, ferromagnetism
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.
11-5639/O4
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/23/6/067502