Abstract
The effects of magnon dissipation on the properties of magnetoelastic waves in ferromagnets in the vicinity of magnetoelastic resonance are investigated. The magnetoelastic waves in this region are strongly anisotropic, and the directions with high intensity (caustic waves) are formed. Dissipation leads to the disappearance of the gap between different magnetoelastic modes, finiteness of amplification factor, and to the damping of caustic waves in some directions. The caustic patterns formed by the caustic waves are transformed due to dissipation. In elastically isotropic and slightly anisotropic ferromagnets, caustics disappear when even a small dissipation is taken into account, while in strongly elastically anisotropic ferromagnets the main features of caustic patterns are retained in a wide region of the external magnetic field. • Magnetoelastic waves in ferromagnets form caustics near magnetoelastic resonance. • Set of caustic directions form caustic patterns. • Structure of caustic patterns is determined by magnitude of constant magnetic field. • Even a small dissipation can destroy caustics in elastically isotropic ferromagnets. • In anisotropic ferromagnets, dissipation retain main features of caustic pattern.
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