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Phys. Rev. B 71, 153310 (2005) [4 pages]

Concentration-independent local ferromagnetic Mn configuration in Ga1−xMnxAs

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D. Wu1, D. J. Keavney2, Ruqian Wu3, E. Johnston-Halperin3, D. D. Awschalom4, and Jing Shi1
1Department of Physics, University of Utah, Salt Lake City, Utah 84112, USA
2Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
3Department of Physics, University of California, Irvine, California 92697, USA
4Department of Physics, University of California, Santa Barbara, California 93106, USA

Received 10 November 2004; revised 18 January 2005; published 25 April 2005

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 L3 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.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.71.153310
DOI:
10.1103/PhysRevB.71.153310
PACS:
75.25.+z, 78.70.Dm, 75.50.−y, 75.70.−i
 
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