Influence of magnetic wave oscillations of magnetization in a moving domain wall in yttrium orthoferrite on the generation of transverse acoustic waves

The purpose of the study in this paper is to take into account the influence of magnetic wave oscillations of magnetization generated in a moving domain wall in a magnetic field in yttrium orthoferrite on a transverse sound wave.
Methods. Solutions of wave equations describing the influence of magnetization oscillations in a moving domain wall and a transverse acoustic wave using the methods of slowly varying amplitudes, perturbation theory and Lagrange.
Results. The influence of magnetic wave oscillations of magnetization accompanying a moving domain boundary, with and without taking into account their absorption in a magnetic field, on a transverse acoustic wave excited in a plate sample of yttrium orthoferrite is described analytically. Taking into account the crystalline and magnetic properties of yttrium orthoferrite (YFeO3) during the movement of a domain boundary in it, estimates are obtained for the contributions of the effect of magnetic wave oscillations of magnetization to the displacements of transverse sound waves. Without taking into account absorption in a magnetic field, the contribution is of the order of 10–7 m, which is comparable with the theoretical thickness of the domain boundary D3 ≈ 10–8 m, and taking into account absorption, it is of the order of 10–14 m.
Conclusion. To develop logical and memory devices whose operation is based on magnetization reversal due to the movement of domain walls at transonic speeds, the mechanisms of the influence of magnetic wave oscillations of magnetization on excited transverse acoustic waves in a YFeO3 plate were studied. Such interaction can significantly affect the quality and accuracy of information processing. The obtained estimates of the contributions of these interactions are important for creating the element base of devices for processing and recording information with magnetic memory based on weak ferromagnets.

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