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We report on the spin-polarized photoreflectance in a ferromagnetic GaMnAs layer. The transient photoreflectance results show a circular polarization dependence of the probe beam in quasi-degenerate pump-probe measurements. The circular polarization dependence, which follows the magnetization as we increase the sample temperature, can be understood from the strong spin exchange coupling between conduction or valence band electrons and localized Mn ion spins.


We report on the spin-polarized photoreflectance in a ferromagnetic GaMnAs layer. The transient photoreflectance results show a circular polarization dependence of the probe beam in quasi-degenerate pump-probe measurements. The circular polarization dependence, which follows the magnetization as we increase the sample temperature, can be understood from the strong spin exchange coupling between conduction or valence band electrons and localized Mn ion spins.