Current‐Induced Reversible Split of Elliptically Distorted Skyrmions in Geometrically Confined Fe₃Sn₂ Nanotrack

Abstract

Skyrmions are swirling spin textures with topological characters promising for future spintronic applications. Skyrmionic devices typically rely on the electrical manipulation of skyrmions with a circular shape. However, manipulating elliptically distorted skyrmions can lead to numerous exotic magneto-electrical functions distinct from those of conventional circular skyrmions, significantly broadening the capability to design innovative spintronic devices. Despite the promising potential, its experimental realization so far remains elusive. In this study, the current-driven dynamics of the elliptically distorted skyrmions in geometrically confined magnet Fe 3 Sn 2 is experimentally explored. This study finds that the elliptical skyrmions can reversibly split into smaller-sized circular skyrmions at a current density of 3.8 × 10 10 A m −2 with the current injected along their minor axis. Combined experiments with micromagnetic simulations reveal that this dynamic behavior originates from a delicate interplay of the spin-transfer torque, geometrical confinement, and pinning effect, and strongly depends on the ratio of the major axis to the minor axis of the elliptical skyrmions. The results indicate that the morphology is a new degree of freedom for manipulating the current-driven dynamics of skyrmions, providing a compelling route for the future development of spintronic devices.

Dynamic behavior of skyrmion collision: spiral and breath

“…Without external fields, the dynamic behaviors of skyrmions are closely related to the number of skyrmions. For individual skyrmion, it is only need to consider its initial state and interaction with the boundary [38]. For multi-skyrmions, however, it is necessary to consider how skyrmions interact with each other.…”

Above-room-temperature chiral skyrmion lattice and Dzyaloshinskii–Moriya interaction in a van der Waals ferromagnet Fe3−xGaTe2

“…These particle-like topological entities are expected to act as information carriers that can be written, erased, and driven by external stimuli with low energy consumption 6 . In addition, certain degrees of freedom in skyrmions, including helicity and polarity, are switchable 7 , 8 , making them particularly suitable for logic and memory applications. In the meantime, the discovery of 2D van der Waals (vdW) magnetic materials, such as Cr 2 Ge 2 Te 6 9 , CrI 3 10 , and Fe 3 GeTe 2 11 , has stimulated a new upsurge in spintronics and materials research.…”