Abstract
We report on the study of Mn transversal spin relaxation mechanisms in ferromagnetic (Ga,Mn)As. The spins of valence band holes experience exchange interactions with ferromagnetically ordered Mn spins and strong spin relaxation due to spin-orbit coupling. The hole subsystem provides a relaxation channel for the Mn spin subsystem. The Mn spin relaxation mechanisms were studied by means of spin flip Raman scattering. Two contributions to the spin flip Raman linewidth were found. The first one dominates below the Curie temperature and is related to the fast hole spin relaxation that damps the collective motion of the coupled Mn and hole spin subsystems. The other contribution to the Mn spin relaxation is related to spin fluctuations of the hole ensemble, which grow with temperature and become most important in the paramagnetic phase.
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