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Abstract
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 magnetic fields applied in
the layer plane only a single frequency is detected for the magnetization precession.
We explain this selectivity of spin mode excitation by the necessity of spatial matching
of magnon and phonon eigenfunctions, which represents a selection rule analogous to
momentum conservation for magnon-phonon interaction in bulk ferromagnetic materials.