Magnonic band structure in a Co/Pd stripe domain system investigated by Brillouin light scattering and micromagnetic simulations

TL;DR

This study combines experimental Brillouin Light Scattering and micromagnetic simulations to analyze spin-wave dynamics in a Co/Pd multilayer with stripe domains, revealing magnonic crystal-like behavior and mode scattering effects.

Contribution

It provides new insights into the magnonic band structure of stripe domain systems using combined experimental and simulation approaches.

Findings

Stripe domains cause scattering of spin-wave modes.

Dispersion relations depend on wave vector orientation.

Mode profiles show magnonic crystal-like features.

Abstract

By combining Brillouin Light Scattering and micromagnetic simulations we studied the spin-wave dynamics of a Co/Pd thin film multilayer, features a stripe domain structure at remanence. The periodic up and down domains are separated by cork-screw type domain walls. The existence of these domains causes a scattering of the otherwise bulk and surface spin-wave modes, which form mode families, similar to a one dimensional magnonic crystal. The dispersion relation and mode profiles of spin waves are measured for transferred wave vector parallel and perpendicular to the domain axis.