Magnetic Bimeron Traveling on the Domain Wall

TL;DR

This paper investigates the stabilization and dynamics of domain wall bimerons in in-plane magnets, revealing mechanisms that enhance their motion and suppress skyrmion Hall effects, with implications for spintronic device efficiency.

Contribution

It introduces new dynamic mechanisms for domain wall bimerons driven by spin-orbit torque, demonstrating their potential for energy-efficient spintronic applications.

Findings

Bimerons can be stabilized within domain walls of in-plane magnets.

Two dynamic mechanisms depend on spin current polarization, affecting bimeron motion.

Bimerons can reach velocities 40 times higher than skyrmions.

Abstract

Domain wall bimerons (DWBMs) are nanoscale spin textures residing within the magnetic domain walls of in-plane magnets. In this study, we employ both numerical and analytical methods to explore the stabilization of N\'eel-type domain wall bimerons and their dynamics when excited by spin-orbit torque. Our findings reveal two unique and intriguing dynamic mechanisms, which depend on the polarization direction of the spin current: In the first scenario, the magnetic domain wall serves as a track that confines the motion of the bimeron and effectively suppresses the skyrmion Hall effect. In the second scenario, pushing the magnetic domain wall triggers a rapid sliding of the bimeron along the wall. This process significantly enhances the dynamics of the bimeron, resulting in a velocity increase of approximately 40 times compared to skyrmions and bimeron solitons. Our results highlight the potential advantages of the skyrmion Hall effect in developing energy-efficient spintronic devices based on domain wall bimerons.