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Two-color, time-resolved reflectivity is used to study femtosecond and picosecond carrier dynamics in III-V ferromagnetic semiconductors. Ultrashort carrier lifetimes, oscillations, and multi-level decay processes were observed. We discuss the dependence of data on the probe wavelength, pump intensity, and sample temperature
We have used two-color time-resolved magneto-optical Kerr effect spectroscopy to study the dynamics of spin/magnetic order in InMnAs. We observed ultrafast photo-induced softening due to spin-polarized transient carriers. This transient softening persists only during the carrier lifetime (~ 2 ps). Our data clearly demonstrates that magnetic properties can be strongly modified in an ultrafast manner
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