Abstract
The magnetic domain pattern in (Ga,Mn)As layers with perpendicular magnetic easy-axis is studied by Kerr microscopy at various temperatures. We investigate the effect of post-growth annealing. As-grown samples exhibit a strongly anisotropic domain growth with dendritic-like expansion of domains along the directions. For annealed samples, the density of nucleation centers is decreased and domain wall propagation is more isotropic. Two kinds of pinning centers are observed in annealed samples: line-like defects that strongly hinder domain wall propagation and point-like defects with a density of a few 10(5) cm(-2).
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