Concentration-independent local ferromagnetic Mn configuration in Ga1-xMnxAs -: art. no. 153310

被引：21
|
作者：
Wu, D [1 ]
Keavney, DJ
Wu, R
Johnston-Halperin, E
Awschalom, DD
Shi, J
机构：
[1] Univ Utah, Dept Phys, Salt Lake City, UT 84112 USA
[2] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA
[3] Univ Calif Irvine, Dept Phys, Irvine, CA 92697 USA
[4] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA
来源：
PHYSICAL REVIEW B | 2005年 / 71卷 / 15期
关键词：
D O I：
10.1103/PhysRevB.71.153310
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A systematic Mn L-edge x-ray absorption and magnetic circular dichroism study is carried out on Ga1-xMnxAs ferromagnetic semiconductors with x ranging from 0.021 to 0.081. The dichroism lineshape of the L-3 peak is found to be independent of x, indicating an identical average local ferromagnetic Mn configuration across the Mn concentration range and the absence of significant second ferromagnetic phase formation. Further first-principles calculations suggest that the single-peak spectroscopic features stem from the presence of a significant amount of dimers composed of substitutional Mn coupled with interstitial Mn.
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页数：4
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