Diverse helicities of dipolar skyrmions

Magnetic skyrmions, vortex -like spin textures possessing remarkable topological electron -magneto properties, have emerged as promising candidates for information storage and processing in future spintronic devices. Helicity, which characterizes the rotational sense of the spin swirl, represents a crucial degree of freedom for encoding information in magnetic skyrmions. Traditionally, states with one and two helicities have been established for skyrmions in chiral and dipolar/frustrated magnets, respectively. In this study, we explore the helicity diversity of dipolar skyrmions in centrosymmetric magnets by extending our investigation to three-dimensional uniaxial magnetic systems. Combining numerical simulations, we demonstrate that the inclusion of additional spin twists along the depth dimension expands the twofold helicity degeneracy to fourfold and potentially beyond. Our findings not only provide insights into the spin models of dipolar skyrmions but also promote the development of topological spintronic devices, leveraging helicity as a key parameter.