Geometrically Constrained Skyrmions

Skyrmions are chiral swirling magnetization structures with nanoscale size. These have attracted considerable attention due to their topological stability and promising applicability in nanodevices, since they can be displaced spin-polarized currents. However, for the comprehensive implementation of skyrmions devices, it is imperative also attain control over geometrical position. Here we show that, through thickness modulations introduced host material, possible constrain three-dimensional desired regions. We investigate skyrmion rectangular FeGe platelets micromagnetic finite element simulations. First, establish a phase diagram minimum-energy magnetic state as function external field strength film thickness. Using this understanding, generate preferential sites material by introducing dot-like “pockets” reduced that these pockets serve pinning centers skyrmions, thus making obtain geometric This allows stabilization at positions configurations would otherwise not attain. Our findings may implications technological applications which used units information along racetrack-type shift register devices.