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Quasi-longitudinal and quasi-transverse picosecond strain pulses injectedinto a ferromagnetic (311) (Ga,Mn)As film induce dynamical shear strain in thefilm, thereby modulating the magnetic anisotropy and inducing resonantprecession of the magnetization at a frequency ~10 GHz. The modulation of theout-of-plane magnetization component by the quasitransverse strain reachesamplitudes as large as 10% of the equilibrium magnetization. Our theoreticalanalysis is in good agreement with the observed results, thus providing astrategy for ultrafast magnetization control in ferromagnetic films by strainpulses.

Magnetization precession induced by quasi-transverse picosecond strain pulses in (311) ferromagnetic (Ga,Mn)As