Abstract
The focusing features and caustic of magnetoelastic waves in Y3Fe5O12 (YIG) crystals in the long wavelength approximation are investigated. It is shown that the interaction of phonon and magnetic subsystems leads to pronounced anisotropic properties of magnetoelastic waves. Four magnetoelastic eigenmodes are realized in the crystal, and two of them possess a focusing and caustic in the vicinity of magnetoelastic resonance point. The region of frequencies and wavenumbers of magnetoelastic waves is obtained, where the caustic can be observed. The directions of the focusing and caustic are defined.
Highlights
The possibility of using magnetic waves in magnetic ordered media in a number of technical devices is due to the unique properties of these waves
It is shown that the interaction of phonon and magnetic subsystems leads to pronounced anisotropic properties of magnetoelastic waves
The purpose of this paper is to investigate the conditions of the magnetoelastic wave focusing
Summary
The possibility of using magnetic waves in magnetic ordered media in a number of technical devices is due to the unique properties of these waves. The purpose of this paper is to take into account the interaction between these two well known subsystems and to investigate the peculiarities of magnetoelastic waves propagation. As it is shown in the paper, the group and phase velocities of magnetoelastic waves in YIG are non-collinear, and it leads to the appearance of preferred directions in the crystal. The intensity of the waves propagating along a specific direction in the focusing region increases sharply. The frequency and wavenumber regions where the caustic can be observed are determined, and the directions of the caustic at the corresponding frequency are defined as well
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