Theoretical study of the processes of electromagnetic excitation of transverse ultrasound in hexagonal magnetics is presented. It is shown, that the amplitude of ultrasound excited sharply increases at ferromagnetic resonance frequency. At frequencies far from ferromagnetic resonance the generation peak took place at the magnetoelastic resonance frequency in the limit of "frozen lattice", and in the limit of "free lattice" the generation peak occurs at the magnetostatic resonance frequency.
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