Spin Wave Propagation through Antiferromagnet/Ferromagnet Interface

TL;DR

This paper investigates how to control spin wave transmission at antiferromagnet/ferromagnet interfaces by tuning material parameters, especially the sublattice noncompensation degree, to manipulate transmittance and reflectance.

Contribution

It introduces the concept of the degree of sublattice noncompensation of antiferromagnet (DSNA) and models spin wave propagation considering this parameter for interface design.

Findings

Transmittance and reflectance depend on frequency and exchange parameters.

Designing interfaces with specific disorder or geometry can tune spin wave propagation.

Theoretical framework for controlling spin waves at magnetic interfaces.

Abstract

We study the problem of controlling spin waves propagation through an antiferromagnet/ferromagnet interface via tuning material parameters. It is done by introducing the degree of sublattice noncompensation of antiferromagnet (DSNA), which is a physical characteristic of finite-thickness interfaces. The DSNA value can be varied by designing interfaces with a particular disorder or curvilinear geometry. We describe a spin-wave propagation through any designed antiferromagnet/ferromagnet interface considering a variable DSNA and appropriate boundary conditions. As a result, we calculate the physical transmittance and reflectance of the spin waves as a function of frequency and show how to control them via the exchange parameters tuning.