Positional disorder, spin-orbit coupling, and frustration in Ga 1-xMn xAs

Gregory A. Fiete, Gergely Zaránd, Boldizsár Jankó, Pawel Redliński, C. Pascu Moca

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

We study the magnetic properties of metallic Ga 1-xMn xAs. We calculate the effective Ruderman-Kittel-Kasuya-Yoshida interaction between Mn spins using several realistic models for the valence band structure of GaAs. We also study the effect of positional disorder of the Mn on the magnetic properties. We find that the interaction between two Mn spins is anisotropic due to spin-orbit coupling both within the so-called spherical approximation and in the more realistic six band model. The spherical approximation strongly overestimates this anisotropy, especially for short distances between Mn ions. Using the obtained effective Hamiltonian we carry out Monte Carlo simulations of finite and zero temperature magnetization and find that, due to orientational frustration of the spins, noncollinear states appear in both valence band approximations for disordered, uncorrelated Mn impurities in the small concentration regime. Introducing correlations among the substitutional Mn positions or increasing the Mn concentration leads to an increase in the remanent magnetization at zero temperature and an almost fully polarized ferromagnetic state.

Original languageEnglish
Article number115202
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume71
Issue number11
DOIs
Publication statusPublished - Mar 15 2005

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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