Nature of Magnetic Coupling between Mn Ions in As-Grown Ga1xMnxAs Studied by X-Ray Magnetic Circular Dichroism

Y. Takeda, M. Kobayashi, T. Okane, T. Ohkochi, J. Okamoto, Y. Saitoh, K. Kobayashi, H. Yamagami, A. Fujimori, A. Tanaka, J. Okabayashi, M. Oshima, S. Ohya, P. N. Hai, and M. Tanaka
Phys. Rev. Lett. 100, 247202 – Published 16 June 2008

Abstract

The magnetic properties of as-grown Ga1xMnxAs have been investigated by the systematic measurements of temperature and magnetic field dependent soft x-ray magnetic circular dichroism (XMCD). The intrinsic XMCD intensity at high temperatures obeys the Curie-Weiss law, but a residual spin magnetic moment appears already around 100 K, significantly above the Curie temperature (TC), suggesting that short-range ferromagnetic correlations are developed above TC. The present results also suggest that the antiferromagnetic interaction between the substitutional and interstitial Mn (Mnint) ions exists and that the amount of the Mnint affects TC.

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  • Received 29 November 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.247202

©2008 American Physical Society

Authors & Affiliations

Y. Takeda1,*, M. Kobayashi2, T. Okane1, T. Ohkochi1, J. Okamoto1,†, Y. Saitoh1, K. Kobayashi1,§, H. Yamagami1,7, A. Fujimori2, A. Tanaka3, J. Okabayashi4,‡, M. Oshima4, S. Ohya5,6, P. N. Hai5, and M. Tanaka5

  • 1Japan Atomic Energy Agency, Synchrotron Radiation Research Center SPring-8, Sayo, Hyogo 679-5148, Japan
  • 2Department of Physics, The University of Tokyo, Hongo, Tokyo 113-0033, Japan
  • 3Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashi-Hiroshima 739-8530, Japan
  • 4Department of Applied Chemistry, The University of Tokyo, Hongo, Tokyo 113-8656, Japan
  • 5Department of Electronic Engineering, The University of Tokyo, Hongo, Tokyo 113-8656, Japan
  • 6PRESTO Japan Science and Technology Agency, Kawaguchi, Saitama 331-0012, Japan
  • 7Department of Physics, Faculty of Science, Kyoto Sangyo University, Kyoto, 603-8555, Japan

  • *ytakeda@spring8.or.jp
  • National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinshuu Science Park, Hsinchu 30077, Taiwan, R. O. C.
  • Department of Physics, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8551, Japan
  • §National Institute for Materials Science, SPring-8, Sayo, Hyogo 679-5198, Japan

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Vol. 100, Iss. 24 — 20 June 2008

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