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Selective spin wave excitation in ferromagnetic (Ga,Mn)As layers by picosecond strain pulses
Preprint
M. Bombeck ,
A. S. Salasyuk ,
B. A. Glavin ,
A. V. Scherbakov ,
C. Brüggemann ,
D. R. Yakovlev ,
V. F. Sapega ,
X. Liu ,
J. K. Furdyna ,
A. V. Akimov ,
M. Bayer
2011-12-14
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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.