  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.
