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One of the main tasks of both magnonics and physics of nonlinear processes on the search for ways of exciting efficiently magnetic oscillations in solids is discussed. According to the earlier developed theoretical predictions, the MuMax3 software is used to carry out a micromagnetic simulation of a nonlinear effect of strong autoresonance amplifying of the amplitude of magnetic oscillations in yttrium-iron garnet under the action of an external excitation field. It is shown that the efficiency of this autoresonance excitation in thin films of ferrimagnetic yttrium-iron garnet nonlinearly depends on the power of the exciting field and the rate of change (scanning) of the exciting frequency. Both the rate of change and power of the exciting frequency are estimated with the aim of direct experimental observation of the autoresonance effect, in view of the real parameters of the yttrium-iron garnet film at room temperature.

MICROMAGNETIC MODELING OF MAGNETIZATION AUTORESONANCE IN YIG THIN FILMS WITH INDUCED UNIAXIAL ANISOTROPY