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

作者：Yang Liu, T. T. Liu, Zuanming Jin, Zhipeng Hou, Deyang Chen, Zhen Fan, Min Zeng, Xubing Lu, Xingsen Gao, Minghui Qin, Jun‐Ming Liu · 发表于：Physical review. B./Physical review. B · 年份：2022 · DOI：10.1103/physrevb.106.064424 · 被引用次数：18 · 研究领域：Magnetic properties of thin films、Physics of Superconductivity and Magnetism、Magnetic and transport properties of perovskites and related materials

Searching for low-power-consuming and highly efficient methods for well-controllable driving of skyrmion motion is one of the most concerning issues for future spintronic applications, raising high concern with the choice of magnetic media and driving scenario. In this work, we propose a scenario of spin-wave-driven skyrmion motion in a ferrimagnetic (FiM) lattice with the net angular momentum ${\ensuremath{\delta}}_{s}$. We investigate theoretically the effect of both ${\ensuremath{\delta}}_{s}$ and the circular polarization of the 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 ${\ensuremath{\delta}}_{s}$, demonstrating the key role of ${\ensuremath{\delta}}_{s}$ as an effective control parameter for the skyrmion motion. Moreover, the spin wave frequency and chirality dependent skyrmion motion are discussed, predicting the frequency enhanced skyrmion Hall motion. This work thus represents an essential contribution to understanding the skyrmion dynamics in a FiM lattice.