Interface coupling properties and reflection of bulk spin waves from biaxial multilayer ferromagnetic media

TL;DR

This paper models the reflection of bulk spin waves in multilayer ferromagnetic media, showing how reflection depends on frequency, magnetic field, and interface coupling, with implications for controlling spin wave behavior.

Contribution

It introduces a model that accounts for non-ideal layer coupling and interface quality in analyzing spin wave reflection in biaxial multilayer ferromagnetic structures.

Findings

Reflection coefficient varies strongly with frequency and magnetic field.

Reflection can be tuned from 0 to 1 by adjusting external parameters.

The model incorporates interface quality effects on spin wave reflection.

Abstract

The reflection coefficient of bulk spin waves from multilayer ferromagnetic structure with periodically modulated parameters of exchange interaction, uniaxial and rhombic magnetic anisotropy and saturation magnetization is calculated with a non-ideal coupling between layers. The strong dependence of spin-wave reflection coefficient on frequency, magnetic field and parameter of interfacial coupling is revealed. It allows changing the reflection intensity from 0 to 1 by changing either only external magnetic field value or frequency. The proposed model of boundary conditions gives the opportunity to take into account the quality of interfaces when studying the reflection processes of spin waves in multilayer structures.