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Using density matrix equations of motion, we predict a femtosecond collectivespin tilt triggered by nonlinear, near--ultraviolet ($\sim$3eV), coherentphotoexcitation of (Ga,Mn)As ferromagnetic semiconductors with linearlypolarized light. This dynamics results from carrier coherences and nonthermalpopulations excited in the \{111\} equivalent directions of the Brillouin zoneand triggers a subsequent uniform precession. We predict nonthermalmagnetization control by tuning the laser frequency and polarization direction.Our mechanism explains recent ultrafast pump--probe experiments.

Femtosecond Coherent Control of Spin with Light in (Ga,Mn)As ferromagnets