Spin wave propagation in ferrimagnetic $Gd_{x}Co_{1-x}$

TL;DR

This paper investigates spin wave propagation in Gd-Co ferrimagnetic films, revealing how composition affects group velocity and attenuation, with implications for high-speed spintronic devices.

Contribution

It provides experimental analysis of spin wave properties in Gd-Co ferrimagnets across different compositions, expanding understanding of ferrimagnetic spin dynamics.

Findings

Group velocity and attenuation length vary with composition.

Ferromagnet-based theory explains spin wave behavior away from compensation point.

Results support potential for ferrimagnets in spintronic applications.

Abstract

Recent advances in antiferromagnetic spin dynamics using rare-earth (RE) and transition-metal (TM) ferrimagnets have attracted much interest for spintronic devices with a high speed and density. In this study, the spin wave properties in the magnetostatic backward volume mode and surface mode in RE-TM ferrimagnetic $Gd_{x}Co_{1-x}$ films with various composition x are investigated using spin wave spectroscopy. The obtained group velocity and attenuation length are well explained by the ferromagnet-based spin wave theory when the composition of $Gd_{x}Co_{1-x}$ is far from the compensation point.