Abstract
AbstractWe report comprehensive temperature and photoexcitation intensity dependent studies of the photoinduced magnetization precession in Ga1–x Mnx As (x = 0.036) by time‐resolved Kerr rotation measurements. We observe coherent oscillations of local Mn spins triggered by an ultrafast photo‐induced reorientation of the easy axis due to changes in the magnetic anisotropy. The amplitude saturation of these oscillations above certain pump intensity is indicative of stabilization of the magnetic easy axis orientation on temperatures above ∼Tc/2. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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