Gilbert Damping in (Ga, Mn) As

ORAL

Abstract

We examine Gilbert damping in (Ga,Mn)As by using a p-d mean-field theory model for the ferromagnetic ground state and a four-band spherical model for the host semiconductor band structure. Within this model it is possible to calculate impurity vertex- corrections to the long-wavelength spin-spin response functions to all orders. Because of spin-orbit coupling in the band structure, beyond leading order vertex corrections make significant contribution to the damping. We comment on the non-monotonic dependence of damping on impurity strength.

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Authors

  • Ion Garate

    • University of Texas at Austin

  • Allan MacDonald

    • University of Texas at Austin
    • University of Texas
    • Dept. of Physics, Univ. of Texas at Austin
    • Department of Physics, University of Texas, Austin, TX 78712
    • Department of Physics, The University of Texas at Austin, Austin Texas 78712
    • The University of Texas at Austin
    • Department of Physics, University of Texas at Austin