Nonlocal effects on magnetism in the diluted magnetic semiconductor Ga1-xMnxAs.
The magnetic properties of the diluted magnetic semiconductor Ga1-xMnxAs are studied within the dynamical cluster approximation. We use the k x p Hamiltonian to describe the electronic structure of GaAs with spin-orbit coupling and strain effects. We show that nonlocal effects are essential for explaining the experimentally observed transition temperature and saturation magnetization. We also demonstrate that the cluster anisotropy is very strong and induces rotational frustration and a cube-edge direction magnetic anisotropy at low temperature. With this, we explain the temperature-driven spin reorientation in this system.
Yu
Unjong
U
Department of Physics and Astronomy & Center for Computation and Technology, Louisiana State University, Baton Rouge, Louisiana 70803, USA.
Nili
Abdol-Madjid
AM
Mikelsons
Karlis
K
Moritz
Brian
B
Moreno
Juana
J
Jarrell
Mark
M