Abstract
ABSTRACT Magnetic semiconductors such as Ga 1-x Mn x As have attracted a great interest in the last years due to their high potential as advanced-performance materials in optical detection and in novel spintronic devices. The carrier dynamics and the nonlinear optical response in low-temperaturegrown GaAs/Ga 1-x Mn x As heterostructures represent an interesting topic much less explored than their electronic transpor t and/or structural studies. We report our optical investigations of Ga 1-x Mn x As films, grown with different Mn concentrations and subject to annealing conditions, by time-resolved, femtosecond pump-probe, differential reflectivity measurements. The analysis of the carrier relaxation times at low temperatures is presented and discussed according to nonequilibrium theories fo r electron scattering in magnetic materials. Keywords: optical pump-probe spectroscopy, magnetic semiconductors , carrier relaxation, spintronics, femtosecond lasers. 1. INTRODUCTION Magnetic semiconductors such as Ga
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