Transportation of topological spin textures at material boundaries

Abstract Using skyrmions or skyrmionium as information storage, e.g., racetrack memory, requires a basis of knowledge on how these topological spin structures react to changes in material parameters, which can be, for instance, purposed for stable storing, efficient writing, and faster transportation. Here, we examine the dynamics of topological spin textures, magnetic skyrmions and skyrmionium at the boundaries where material properties vary. Using micromagnetic simulations, we investigated the dependence of the location and radius variation in exchange stiffness, magnetic saturation, Dzyaloshinskii–Moriya Interaction, and anisotropy. There is also a comparison made between the feasibility of skyrmionium as an alternative to skyrmions as a method of storing and transportation information.