Local structures of Mn in dilute magnetic semiconductor ZnMnO

被引：25
|
作者：
Xu, Wei
Zhou, Yingxue
Zhang, Xinyi
Chen, Dongliang
Xie, Yaning
Liu, Tao
Yan, Wensheng
Wei, Shiqiang
机构：
[1] Fudan Univ, Dept Phys, Surface Phys Lab, Natl Key Lab, Shanghai 200433, Peoples R China
[2] Fudan Univ, Synchrotron Radiat Res Ctr, Shanghai 200433, Peoples R China
[3] Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100049, Peoples R China
[4] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Peoples R China
来源：
SOLID STATE COMMUNICATIONS | 2007年 / 141卷 / 07期
关键词：
EXAFS; local structure; dilute magnetic semiconductor;
D O I：
10.1016/j.ssc.2006.11.027
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The local structures of Mn atoms in (Zn, Mn)O have been investigated by extended x-ray absorption fine structure (EXAFS). For samples with lower Mn concentrations (< 11%), EXAFS results show that the majority of Mn atoms are incorporated at Zn substitutional sites. Ferromagnetic behavior has been observed in those ZnMnO samples. It is the direct evidence to suppose that the ferromagnetism in (Zn, Mn)O is not due to Mn-related secondary phases but is intrinsic. When the Mn concentration is increased to 20% or higher, the EXAFS simulation shows the formation of MnO secondary phases and the films show a change from ferromagnetic (FM) to antiferromagnetic (AFM) state. We suggest that Mn-related secondary phases might be responsible for the transformation from FM to AFM state. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码：374 / 377
页数：4
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