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In-plane uniaxial anisotropy rotations in (Ga,Mn)As thin films

Sawicki M., Wang K.-Y., Edmonds K.W., Campion R.P., Staddon C.R., Farley N.R.S., Foxon C.T., Dietl T., Gallagher B.L.

Materials Science Poland

2006

Vol. 24, No. 3

627--631

Using SQUID magnetometry we find that in (Ga,Mn)As films the in-plane uniaxial magnetic easy axis is consistently associated with particular crystallographic directions. It can be rotated from the [-110] direction to the [110] direction by low temperature annealing and we show that this change is hole density related. We demonstrate that the magnitude of uniaxial anisotropy as well its dependence on the hole-concentration and temperature can be explained in terms of the p-d Zener model of the ferromagnetism assuming a small trigonal-like distortion.