Abstract
One of the main problems of magnonics is finding the ways of efficiently spin waves excitation in a magnet. This paper considers the method of nonlinear amplification by phase locking of amplitude of dynamic magnetization in yttrium-iron garnet film performed by micromagnetic modeling with MuMAX3 software taking into account the real materials parameters. It is shown that the excited magnetization precession can be considered as a autoresonance phenomena. The intensity of the autoresonance in ferrimagnetic yttrium-iron garnet films has threshold dependence on the chirp rate of the exciting magnetic field.
Highlights
There are many various theoretical finite-difference and numerical methods for studying dynamic magnetic properties of complex magnet systems
This paper considers the method of nonlinear amplification by phase locking of amplitude of dynamic magnetization in yttrium-iron garnet film performed by micromagnetic modeling with MuMAX3 software taking into account the real materials parameters
Magnetic oscillations in the YIG film were excited by linear harmonic variables field h0 with amplitude of 1 Oe directed in the plane of the film and perpendicular to the permanent field Hz
Summary
There are many various theoretical finite-difference and numerical methods for studying dynamic magnetic properties of complex magnet systems. The numerical calculations are widely used to solve actual problems of microwave electronics connected with the effective excitation, amplification and propagation of spin waves in magnetic materials in the Landau-Lifshitz formalism [1]. Due to the large number of considered interaction terms and the versatile geometrical options the MuMAX3 has been successfully applied to predict the excitation and propagation of spin waves in real magnetic materials, e.g. yttrium-aluminum-garnet (YIG) films, e.g. Though the autoresonance effect, which constitutes the basis of this method, has been widely discussed in various fields of modern physics of nonlinear phenomena [9], there are neither numerical calculations nor direct experimental confirmation, by exception work [10] considering plasma oscillations. The developed analytical theory [6,7,8] does not take into account a few important for experiments parameters, for example: the geometry of the sample and demagnetizing factors, dipoledipole interaction, attenuation and so on
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