Angle-Dependent X-Ray Magnetic Circular Dichroism from (Ga,Mn)As: Anisotropy and Identification of Hybridized States

K. W. Edmonds, G. van der Laan, A. A. Freeman, N. R. S. Farley, T. K. Johal, R. P. Campion, C. T. Foxon, B. L. Gallagher, and E. Arenholz
Phys. Rev. Lett. 96, 117207 – Published 22 March 2006

Abstract

Remarkably anisotropic Mn L2,3 x-ray magnetic circular dichroism spectra from the ferromagnetic semiconductor (Ga,Mn)As are reported. States with cubic and uniaxial symmetry are distinguished by careful analysis of the angle dependence of the spectra. The multiplet structures with cubic symmetry are qualitatively reproduced by calculations for an atomiclike d5 configuration in tetrahedral environment, and show zero anisotropy in the orbital and spin moments within the experimental uncertainty. However, hybridization with the host valence bands is reflected by the presence of a preedge feature with a uniaxial anisotropy and a marked dependence on the hole density.

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  • Received 8 November 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.117207

©2006 American Physical Society

Authors & Affiliations

K. W. Edmonds1, G. van der Laan2, A. A. Freeman1,2, N. R. S. Farley1,2, T. K. Johal2, R. P. Campion1, C. T. Foxon1, B. L. Gallagher1, and E. Arenholz3

  • 1School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom
  • 2CCLRC Daresbury Laboratory, Warrington WA4 4AD, United Kingdom
  • 3Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

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Vol. 96, Iss. 11 — 24 March 2006

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