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Photo-excited precession of magnetization in (Ga,Mn)As is investigated bymeasuring time-resolved magneto-optical response and transient differentialreflectivity with pump-and-probe technique. In the time region less than 1 ps,rapidly oscillating and spike-like signals are observed, respectively, withexcitation of below and above the GaAs band gap. Analysis with gyromagneticmodel and autocorrelation function concludes that those signals are notattributed to ultrafast demagnetization but due to interference between pumpand probe pulses incorporating sub-ps carrier dynamics characteristic oflow-temperature grown semiconductors. Photo-ionization of Mn ions (Mn2+ ->Mn3+) is proposed as a mechanism which dynamically induces orbital angularmomentum and affects hole-mediated magnetic anisotropy in (Ga,Mn)As.

Dynamics of magnetization and carriers at the onset of the photo-excited precession of magnetization in (Ga,Mn)As