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We demonstrate selective excitation of a spin wave mode in a ferromagnetic(Ga,Mn)As film by picosecond strain pulses. For a certain range of magneticfields applied in the layer plane only a single frequency is detected for themagnetization precession. We explain this selectivity of spin mode excitationby the necessity of spatial matching of magnon and phonon eigenfunctions, whichrepresents a selection rule analogous to momentum conservation formagnon-phonon interaction in bulk ferromagnetic materials.

Selective spin wave excitation in ferromagnetic (Ga,Mn)As layers by picosecond strain pulses