The studies on phonons and magnons in (Ni80Fe20/Au/Co/Au) multilayers of different number of repetitions

TL;DR

This study investigates how varying the number of layers in Ni80Fe20/Au/Co/Au multilayers affects the interaction between spin waves and surface acoustic waves, demonstrating tunable magnetoelastic coupling.

Contribution

It reveals that multilayer repetition number can control magnetoelastic interactions without altering fundamental spin wave modes.

Findings

Dispersion of surface acoustic waves can be tuned by multilayer repetitions.

Magnetoelastic interaction can be activated or deactivated by multilayer thickness.

Fundamental spin wave modes remain largely unaffected by multilayer variations.

Abstract

In Ni80Fe20/Au/Co/Au deposited on silicon substrate the interaction between spin waves and surface acoustic waves is observed by Brillion light scattering spectroscopy. We show that by changing the number of receptions in the multilayer we can tune the dispersion of surface acoustic waves (SAWs) not affecting significantly fundamentals spin wave (SW) mode. As a result, we can control (activate or deactivate) the magnetoelastic interaction between fundamental SW mode and SAWs by the thickness of the magnetostrictive multilayer.