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

被引：7

作者：

Qin Xiu-Bo ^{[1
,4
]}

Li Dong-Xiang ^{[2
]}

Li Rui-Qin ^{[2
]}

Zhang Peng ^{[1
]}

Li Yu-Xiao ^{[3
]}

Wang Bao-Yi ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst High Energy Phys, Key Lab Nucl Anal Tech, Beijing 100049, Peoples R China

[2] Anshun Univ, Sch Math & Phys, Anshun 561000, Peoples R China

[3] Zhengzhou Univ, Sch Phys Engn, Zhengzhou 450001, Peoples R China

[4] Chinese Acad Sci, Inst High Energy Phys, Div Nucl Technol & Applicat, Beijing 100049, Peoples R China

来源：

CHINESE PHYSICS B | 2014年 / 23卷 / 06期

基金：

中国国家自然科学基金;

关键词：

N doping; titanium vacancies; replacement of O with N atoms; ferromagnetism;

D O I：

10.1088/1674-1056/23/6/067502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

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.

引用

页数：5

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