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 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
01.03.2013
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1674-1056 2058-3834 |
| DOI | 10.1088/1674-1056/22/3/037504 |
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| Abstract | 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. |
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| AbstractList | 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. |
| Author | 李东翔 秦秀波 郑黎荣 李玉晓 曹兴忠 李卓昕 杨静 王宝义 |
| AuthorAffiliation | Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China School of Physical Engineering, Zhengzhou University, Zhengzhou 450001, China Research Center for Application of Nuclear Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China |
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| Notes | 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 |
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| Snippet | Room-temperature ferromagnetism has been experimentally observed in annealed rutile TiO2 single crystals when a magnetic field is applied parallel to the... |
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| SubjectTerms | 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 |
| Title | Defect types and room-temperature ferromagnetism in undoped rutile TiO2 single crystals |
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