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Condensed Matter > Mesoscale and Nanoscale Physics
Title: Bimeron Traveling on the Magnetic Domain Wall
(Submitted on 24 Apr 2024 (v1), last revised 26 Apr 2024 (this version, v2))
Abstract: 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.
Submission history
From: Xiaoguang Li [view email][v1] Wed, 24 Apr 2024 11:25:04 GMT (28432kb,D)
[v2] Fri, 26 Apr 2024 02:11:44 GMT (24056kb,D)
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