Temperature Behavior of Uniaxial Anisotropy along [100] Direction in GaMnAs Films

Abstract

We have investigated a uniaxial anisotropy along the [100] direction of GaMnAs film grown on (001) GaAs. The hysteresis observed in the angular dependence of the planar Hall resistance shifted toward the [010] and [0 (1) over bar0] directions. This phenomenon was analyzed by introducing an additional uniaxial anisotropy field H-u2 along the [100] direction. The magnitude of H-u2 is much smaller than those of the cubic H-c and uniaxial H-u1 anisotropy fields for this material. The temperature behavior of H-u2 appears to be very similar to that of H-u1, suggesting the possibility that H-u1 and H-u2 have a common origin. (C) 2013 The Japan Society of Applied Physics