Complex domain wall dynamics in compressively strained GaMnAs epilayers
  The domain wall induced reversal dynamics in compressively strained GaMnAs was studied employing the magneto-optical Kerr effect and Kerr microscopy. Due to the influence of an uniaxial part in the in-plane magnetic anisotropy (90+/-Delta) domain walls with considerably different dynamic behavior are observed. While the (90+Delta) reversal is identified to be propagation dominated with a small number of domain walls, the case of (90-Delta) reversal includes the nucleation of many domain walls. The domain wall nucleation/propagation energy for both transitions are estimated using model calculations from which we conclude that single domain devices can be achievable using the (90+Delta) mode. 
L. Herrera Diez, R. K. Kremer, A. Enders, M. R\"ossle, E. Arac, J.   Honolka, K. Kern, E. Placidi, F. Arciprete