Inelastic spin-wave scattering by Bloch domain wall flexure oscillations

TL;DR

This paper investigates inelastic spin wave scattering caused by flexure oscillations of Bloch domain walls in thin magnetic films, highlighting the angular dependence and differences between magnon emission and absorption processes.

Contribution

It introduces a theoretical approach to analyze inelastic spin wave scattering involving Winters magnons and the dynamical electromagnetic fields generated by domain wall oscillations.

Findings

Scattering probability increases with scattering angle, reaching up to 900.

Magnon absorption processes show a stronger angular dependence than emission.

The results suggest experimental methods to distinguish emission and absorption processes.

Abstract

The calculations of the inelastic spin wave scattering by flexure vibrations of the Bloch domain wall (Winters magnons) in thin magnetic films are presented. The approach is based on the interaction of the propagating spin waves with the dynamical emergent electromagnetic field generated by the moving inhomogeneous magnetization texture (domain wall). The probability of the spin wave scattering for the Winters magnon emission and absorption processes essentially rises with the spin wave scattering angle increase up to 900. The angular dependence of the scattering probability is essentially stronger for the magnon absorption processes that allow distinguishing these elementary emission/absorption processes experimentally.