Investigation of phonons and magnons in [Ni80Fe20/Au/Co/Au]N multilayers

TL;DR

This study investigates phonon-magnon interactions in Ni80Fe20/Au/Co/Au multilayers, demonstrating control over magnetoelastic coupling and surface acoustic wave dispersion through multilayer engineering.

Contribution

It introduces a method to selectively control phonon-magnon interactions and surface acoustic wave dispersion in multilayers by adjusting layer thickness and number.

Findings

Controlled magnetoelastic interaction via layer thickness adjustment

Precise tuning of surface acoustic wave dispersion

Minimal impact on fundamental spin wave mode

Abstract

The interaction between phonons and magnons is a widely developing topic, especially in the field of acoustic spintronics. To discuss this interaction, it is necessary to observe two different waves (acoustic and spin waves) with the same frequency and wavelength. In the Ni80Fe20/Au/Co/Au system deposited on a silicon substrate, we observe the interaction between spin waves and surface acoustic waves using Brillouin light scattering spectroscopy. As a result, we can selectively control (activate or deactivate) the magnetoelastic interaction between the fundamental spin wave mode and surface acoustic waves by adjusting the magnetostrictive layer thickness in the multilayer. We demonstrate that by adjusting the number of layers in a multilayer structure, we can precisely control the dispersion of surface acoustic waves, with minimal impact on the fundamental spin wave mode