Bimeron Traveling on the Magnetic Domain Wall

Magnetic domain wall bimerons (DWBMs) are topological 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 DWBMs in a ferromagnet (FM)/heavy metal (HM) bilayer, facilitated by interfacial Dzyaloshinsky-Moriya interaction (DMI), and their dynamics when excited by damping-like 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 DWBM, resulting in a velocity increase of approximately 40 times compared to other topological solitons, including skyrmions and bimeron solitons. The damping effect plays a varied role in these mechanisms. Our results highlight the potential advantages of the skyrmion Hall effect in developing energy-efficient spintronic devices based on domain wall bimerons.