Abstract
The possibility of the thermal self-focusing of an acoustic beam in the magnetics near the temperature of the orientational phase transition (OPT) is theoretically investigated. As the system stability is low near the OPT temperature, it facilitates the observation of the non-linear acoustic effects at moderate amplitudes. The non-linearity of the acoustic wave propagation is caused by the magnetostriction. The dissipation of the energy of the acoustic wave results in the increase of the temperature, and the decrease of the FMR frequency. It, in turn, leads to changes of the acoustic properties of the material, acoustic wave self-action.
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