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