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

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

2011-12-15

arxiv.org/abs/1112.3394v1

Physics

Condensed Matter

Materials Science

16 pages, 3 figures, submitted to PRL

Scientific paper

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.

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