Spontaneous skyrmion chains in nanorods with chiral interactions

TL;DR

This paper demonstrates through simulations that cylindrical nanorods can spontaneously host chains of skyrmions, with their formation depending on the rod's diameter and length, revealing how geometry influences topological spin textures.

Contribution

It uncovers the conditions under which skyrmion chains form spontaneously in nanorods, highlighting the role of geometry and confinement in stabilizing topological spin textures.

Findings

Skyrmion chains emerge dynamically in nanorods with diameter larger than the helical pitch.

Number of skyrmions in the chain scales with nanorod length.

Geometry and confinement stabilize topological spin textures.

Abstract

We report that in cylindrical nanorods skyrmion chains, i.e., three-dimensional spin textures, emerge dynamically, as revealed by micromagnetic simulations. The skyrmion-chain state occurs when the diameter of the rod is larger than the helical pitch length of the material, and the number of skyrmions on the chain is proportional to the length of the nanorod. This finding provides a deeper understanding of the interplay between geometry and skyrmionic symmetry, and shows how spatial confinement can stabilize spontaneous topological spin textures.