Observation of propagating edge spin waves modes

TL;DR

This study investigates edge and bulk spin wave modes in triangular Permalloy dots, revealing edge spin waves propagating along edges in the buckle state and two-dimensional spin waves in the Y state, with implications for magnonic applications.

Contribution

It provides the first detailed micromagnetic analysis of edge spin waves in triangular dots, highlighting their propagation characteristics and potential for magnonic device integration.

Findings

Edge spin waves propagate along edges in the buckle state.

Spin waves in the Y state exhibit two-dimensional behavior.

Edge spin waves are weakly affected by interdot interactions.

Abstract

Broadband magnetization response of equilateral triangular 1000 nm Permalloy dots has been studied under an in-plane magnetic field, applied parallel (buckle state) and perpendicular (Y state) to the triangles base. Micromagnetic simulations identify edge spin waves (E-SWs) in the buckle state as SWs propagating along the two adjacent edges. These quasi one-dimensional spin waves emitted by the vertex magnetic charges gradually transform from propagating to standing due to interference and are weakly affected by dipolar interdot interaction and variation of the aspect ratio. Spin waves in the Y state have a two dimensional character. These findings open perspectives for implementation of the E-SWs in magnonic crystals and thin films.