Spin-wave-driven skyrmion dynamics in ferrimagnets: Effect of net angular momentum

TL;DR

This paper theoretically explores how spin waves can drive skyrmion motion in ferrimagnets, revealing the influence of net angular momentum and spin wave polarization on skyrmion dynamics, with potential implications for low-power spintronic devices.

Contribution

It introduces a novel spin wave-driven skyrmion control mechanism in ferrimagnets, highlighting the role of net angular momentum as an effective control parameter.

Findings

Skyrmion Hall angle depends on net angular momentum {}s.

Spin wave frequency enhances skyrmion Hall motion.

Partitioning of spin wave momentum into ferromagnetic and antiferromagnetic components.

Abstract

Searching for low-power-consuming and high-efficient methods for well controllable driving of skyrmion motion is one of the most concerned issues for future spintronic applications, raising high concern with an appreciated choice of magnetic media and driving scenario. In this work, we propose a novel scenario of spin wave driven skyrmion motion in a ferrimagnetic (FiM) lattice with the net angular momentum {\delta}s. We investigate theoretically the effect of both {\delta}s and the circular polarization of spin wave on the skyrmion dynamics. It is revealed that the momentum onto the skyrmion imposed by the excited spin wave can be partitioned into a ferromagnetic term plus an antiferromagnetic term. The ratio of these two terms and consequently the Hall angle of skyrmion motion can be formulated as the functions of {\delta}s, demonstrating the key role of {\delta}s as an effective control-parameter for the skyrmion motion. Moreover, the spin wave frequency dependent skyrmion motion is discussed, predicting the frequency enhanced skyrmion Hall motion. This work thus represents an essential contribution to understand the skyrmion dynamics in a FiM lattice.