Critical behavior from the anomalous Hall effect in (GaMn)As

Wanjun Jiang, André Wirthmann, Y. S. Gui, X. Z. Zhou, M. Reinwald, W. Wegscheider, C.-M. Hu, and Gwyn Williams
Phys. Rev. B 80, 214409 – Published 10 December 2009

Abstract

An unconventional approach to scaling based on the anomalous Hall effect is presented and utilized to demonstrate conclusively that epitaxial (metallic) Ga0.98Mn0.02As is a mean-field ferromagnet. Such a result provides strong support for the assertion that the underlying interactions can be treated within the framework of Landau mean-field theory, direct support for which had previously been lacking. This scaling approach also provides confirmation—albeit indirect—that the origin of the anomalous Hall effect in this system is intrinsic at the composition studied.

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  • Received 28 September 2009

DOI:https://doi.org/10.1103/PhysRevB.80.214409

©2009 American Physical Society

Authors & Affiliations

Wanjun Jiang1,*, André Wirthmann1, Y. S. Gui1, X. Z. Zhou1, M. Reinwald2, W. Wegscheider2, C.-M. Hu1, and Gwyn Williams1

  • 1Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
  • 2Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstraße 31, 93040 Regensburg, Germany

  • *jiang@physics.umanitoba.ca

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Vol. 80, Iss. 21 — 1 December 2009

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