期刊
CHINESE PHYSICS B
卷 23, 期 6, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1674-1056/23/6/067502
关键词
N doping; titanium vacancies; replacement of O with N atoms; ferromagnetism
资金
- Young Scientists Fund of the National Natural Science Foundation of China [61006066]
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.
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