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

Room-temperature ferromagnetism has been experimentally observed in annealed rutile TiO2 single crystals when a magnetic field is applied parallel to the sample plane.By combining X-ray absorption near the edge structure spectrum and positron annihilation lifetime spectroscopy,Ti^3＋-V O defect compl...

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Published in中国物理B：英文版 no. 3; pp. 491 - 494
Main Author 李东翔 秦秀波 郑黎荣 李玉晓 曹兴忠 李卓昕 杨静 王宝义
Format Journal Article
LanguageEnglish
Published 01.03.2013
Subjects
X射线吸收近边结构谱
二氧化钛
室温
正电子湮没寿命谱
缺陷类型
金红石型
钛单晶
铁磁性
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ISSN1674-1056
2058-3834
DOI10.1088/1674-1056/22/3/037504

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Summary:Room-temperature ferromagnetism has been experimentally observed in annealed rutile TiO2 single crystals when a magnetic field is applied parallel to the sample plane.By combining X-ray absorption near the edge structure spectrum and positron annihilation lifetime spectroscopy,Ti^3＋-V O defect complexes（or clusters） have been identified in annealed crystals at a high vacuum.We elucidate that the unpaired 3d electrons in Ti^3＋ ions provide the observed room-temperature ferromagnetism.In addition,excess oxygen ions in the TiO2 lattice could induce a number of Ti vacancies which obviously increase magnetic moments.
Bibliography:Room-temperature ferromagnetism has been experimentally observed in annealed rutile TiO2 single crystals when a magnetic field is applied parallel to the sample plane.By combining X-ray absorption near the edge structure spectrum and positron annihilation lifetime spectroscopy,Ti^3＋-V O defect complexes（or clusters） have been identified in annealed crystals at a high vacuum.We elucidate that the unpaired 3d electrons in Ti^3＋ ions provide the observed room-temperature ferromagnetism.In addition,excess oxygen ions in the TiO2 lattice could induce a number of Ti vacancies which obviously increase magnetic moments.
Li Dong-Xiang , Qin Xiu-Bo , Cao Xing-Zhong , Li Zhuo-Xin , Zheng Li-Rong , Li Yu-xiao, Yang Jing, Wang Bao-Yi（ 1） Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China ;2 ） School of Physical Engineering, Zhengzhou University, Zhengzhou 450001, China ;3） Research Center for Application of Nuclear Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China ;4）Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
annealing,oxygen vacancies,Ti^3＋-V O defect complexes,ferromagnetism
11-5639/O4
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/22/3/037504