Magnetization dynamics in magnonic structures with different geometries: interfaces, notches and waveguides

TL;DR

This paper investigates how the geometry of magnonic structures like interfaces, notches, and waveguides influences magnetization dynamics, focusing on surface spin-wave modes and their propagation in magnetic films.

Contribution

It introduces a study of broadband spin-wave excitation at magnonic crystal interfaces, highlighting the role of geometry and magnetic field direction in surface mode propagation.

Findings

Surface spin-wave modes propagate out of the crystal into the film.

Propagation distance varies with magnetic field direction.

Surface geometry affects spin-wave propagation.

Abstract

The discovery of the ultrafast magnetization dynamics twenty years ago has led to a broad variety of experimental techniques to explore phenomena in magnetic materials with high temporal resolution. In the present article we present a study dealing with broadband excitation of spin-wave packets at different magnonic crystal continuous magnetic film interfaces. Similar to protected conducting states on the surfaces of topological band insulators, these interfaces exhibit surface spin-wave modes that propagate out of the crystal into the continuous film. The propagation distance depends on the direction of the applied magnetic field as well as the surface geometry of the crystal.