Manipulating coupling state and magnetism of Mn-doped ZnO nanocrystals by changing the coordination environment of Mn via hydrogen annealing

doi:10.1088/1674-1056/25/1/017301

中国物理B ›› 2016, Vol. 25 ›› Issue (1): 17301-017301.doi: 10.1088/1674-1056/25/1/017301

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Manipulating coupling state and magnetism of Mn-doped ZnO nanocrystals by changing the coordination environment of Mn via hydrogen annealing

Yan Cheng(程岩), Wen-Xian Li(李文献), Wei-Chang Hao(郝维昌), Huai-Zhe Xu(许怀哲), Zhong-Fei Xu(徐忠菲), Li-Rong Zheng(郑离荣), Jing Zhang(张静),Shi-Xue Dou(窦士学), Tian-Min Wang(王天民)

1. Department of Physics and Center of Materials Physics and Chemistry, Beihang University, Beijing 100191, China;
2. Solar Energy Technologies, School of Computing, Engineering and Mathematics, University of Western Sydney, Penrith, NSW 2751, Australia;
3. Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong, NSW 2522, Australia;
4. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

收稿日期:2015-05-05 修回日期:2015-08-21 出版日期:2016-01-05 发布日期:2016-01-05
通讯作者: Wei-Chang Hao, Huai-Zhe Xu E-mail:whao@buaa.edu.cn;hzxu@buaa.edu.cn
基金资助:
Project supported by the National Basic Research Program of China (Grant No. 2013CB934001) and the National Natural Science Foundation of China (Grant Nos. 51072012 and 51272015).

Manipulating coupling state and magnetism of Mn-doped ZnO nanocrystals by changing the coordination environment of Mn via hydrogen annealing

Yan Cheng(程岩)¹, Wen-Xian Li(李文献)^2,3, Wei-Chang Hao(郝维昌)¹, Huai-Zhe Xu(许怀哲)¹, Zhong-Fei Xu(徐忠菲)¹, Li-Rong Zheng(郑离荣)⁴, Jing Zhang(张静)⁴,Shi-Xue Dou(窦士学)³, Tian-Min Wang(王天民)¹

1. Department of Physics and Center of Materials Physics and Chemistry, Beihang University, Beijing 100191, China;
2. Solar Energy Technologies, School of Computing, Engineering and Mathematics, University of Western Sydney, Penrith, NSW 2751, Australia;
3. Institute for Superconducting and Electronic Materials (ISEM), University of Wollongong, Wollongong, NSW 2522, Australia;
4. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

Received:2015-05-05 Revised:2015-08-21 Online:2016-01-05 Published:2016-01-05
Contact: Wei-Chang Hao, Huai-Zhe Xu E-mail:whao@buaa.edu.cn;hzxu@buaa.edu.cn
Supported by:
Project supported by the National Basic Research Program of China (Grant No. 2013CB934001) and the National Natural Science Foundation of China (Grant Nos. 51072012 and 51272015).

摘要/Abstract

摘要：

Mn-doped ZnO nanocrystals are synthesized by a wet chemical route and treated in H₂/Ar atmosphere with different H₂/Ar ratios. It is found that hydrogen annealing could change the coordination environment of Mn in ZnO lattice and manipulate the magnetic properties of Mn-doped ZnO. Mn ions initially enter into interstitial sites and a Mn³⁺O₆ octahedral coordination is produced in the prepared Mn-doped ZnO sample, in which the nearest neighbor Mn³⁺ and O² ions could form a Mn³⁺-O^2--Mn³⁺ complex. After H₂ annealing, interstitial Mn ions can substitute for Zn to generate the Mn²⁺O₄ tetrahedral coordination in the nanocrystals, in which neighboring Mn²⁺ ions and H atoms could form a Mn²⁺-O^2--Mn²⁺ complex and Mn-H-Mn bridge structure. The magnetic measurement of the as-prepared sample shows room temperature paramagnetic behavior due to the Mn³⁺-O^2--Mn³⁺ complex, while the annealed samples exhibit their ferromagnetism, which originates from the Mn-H-Mn bridge structure and the Mn-Mn exchange interaction in the Mn²⁺-O^2--Mn²⁺ complex.

关键词: coordination environment, magnetic coupling, x-ray absorption fine structure

Abstract:

Key words: coordination environment, magnetic coupling, x-ray absorption fine structure

中图分类号: (Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems)

73.21.-b

75.50.Pp (Magnetic semiconductors) 75.75.-c (Magnetic properties of nanostructures) 78.70.Dm (X-ray absorption spectra)

程岩, 李文献, 郝维昌, 许怀哲, 徐忠菲, 郑离荣, 张静, 窦士学, 王天民. Manipulating coupling state and magnetism of Mn-doped ZnO nanocrystals by changing the coordination environment of Mn via hydrogen annealing[J]. 中国物理B, 2016, 25(1): 17301-017301.

Yan Cheng(程岩), Wen-Xian Li(李文献), Wei-Chang Hao(郝维昌), Huai-Zhe Xu(许怀哲), Zhong-Fei Xu(徐忠菲), Li-Rong Zheng(郑离荣), Jing Zhang(张静),Shi-Xue Dou(窦士学), Tian-Min Wang(王天民). Manipulating coupling state and magnetism of Mn-doped ZnO nanocrystals by changing the coordination environment of Mn via hydrogen annealing[J]. Chin. Phys. B, 2016, 25(1): 17301-017301.

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Manipulating coupling state and magnetism of Mn-doped ZnO nanocrystals by changing the coordination environment of Mn via hydrogen annealing

Manipulating coupling state and magnetism of Mn-doped ZnO nanocrystals by changing the coordination environment of Mn via hydrogen annealing

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