Vector vorticity of skyrmionic texture: an internal degree of freedom tunable by magnetic field

Abstract

Different from the skyrmion driven by the Dzyaloshinskii-Moriya interaction in non-centrosymmetric materials, the skyrmionic texture in centrosymmetric magnet may possess the extra internal degrees of freedom, which greatly enrich its morphologies, imply the continuous deformation allowed by topological protection, and enable flexible tunability and potential functionality. To describe the internal degree of freedom to full extent, the conventional integer-valued scalar vorticity is extended into a vector vorticity with continuous rotation allowed. The further simplified vorticity angle, together with helicity angle, represents the whole rotation freedom of spin space. The centrosymmetric magnet with frustration provides a perfect platform for realizing a controllable manipulation on these internal degrees of freedom, where the magnetic field can be applied to tune vorticity continuously in both crystal and isolated forms of skyrmionic texture, and the helicity can be further controlled by electric field. Moreover, the simulation reveals the distinctive dynamic effects related to the vorticity modulation, namely, a straight motion can be generated by rotating magnetic field to tune vorticity, and the vorticity can also be controlled to modulate the dynamics induced by the spin polarized current.

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• Frustration-induced magnetic bimerons in transition metal halide CoX2 (X = Cl, Br) monolayers
• Stability of Skyrmion Crystal Phase in Centrosymmetric Distorted Triangular-Lattice Antiferromagnets
• Dynamics of asymmetrically deformed skyrmion driven by internal forces and strain force in a flower-shaped magnetic nanostructure
• A Magnon Band Analysis of GdRu2Si2 in the Field-Polarized State
• Magnetoelectric imprint of skyrmions in van der Waals bilayers
• Antitopological magnetic textures in an antiferromagnetically coupled bilayer with frustration
• Crescent domain-wall pairs in anisotropic two-dimensional MnOI monolayer with fast dynamics