Figure 3
From: Manipulating Topological States by Imprinting Non-Collinear Spin Textures
Theoretically predicted switching of skyrmion number S via out-of-plane magnetic fields (Ji = 0.4 mJ/m2). Initially out-of-plane saturated samples (positive field) exhibit donut state type II at remanence with a topological charge close to zero (0.07). At negative fields, all Co/Pd spins except the vortex core reverse, increasing the charge to one until the core switches as well. Setting the field to zero before the core switches results in donut state type I with a nonzero topological charge (0.93). Insets depict the z magnetisation component.
