Phys. Rev. B 106, L020404 (2022)
Spin wave driven domain wall motion in easy-plane ferromagnets: A particle perspective
Jin Lan1,* and Jiang Xiao2,3,4,5,6,†
1 Center for Joint Quantum Studies and Department of Physics, School of Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China
2 Department of Physics and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China
3 Institute for Nanoelectronics Devices and Quantum Computing, Fudan University, Shanghai 200433, China
4 Shanghai Research Center for Quantum Sciences, Shanghai 201315, China
5 Shanghai Qi Zhi Institute, 200232 Shanghai, China
6 Zhangjiang Fudan International Innovation Center, Fudan University, Shanghai 201210, China
* Corresponding author: lanjin@tju.edu.cn
† Corresponding author: xiaojiang@fudan.edu.cn
Abstract
In easy-plane ferromagnets, we show that the interplay between a domain wall and a spin wave packet can be formulated as the collision of two massive particles with a gravitylike attraction. In the presence of magnetic dissipation, the domain wall mimics a particle subject to viscous friction, while the spin wave packet resembles a particle of variable mass. Due to the attractive nature of the interaction, the domain wall acquires a backward displacement as a spin wave packet penetrating the domain wall, even though there is no change in momentum of the wave packet before and after penetration.
