Abstract
We have investigated the magnetic properties and micromagnetic structure of multilayer Co/Pt films with the variation of bilayer thickness ([Co(0.3 × t nm)/Pt(0.5 × t nm)]10). The films represent Co-Pt alloys with periodic Co vs Pt composition. The magnetic force microscopy and Lorentz transmission electron microscopy have demonstrated the presence of N é el-type skyrmions in the films. The density of skyrmions was found to be strongly dependent on the bilayer thickness parameter (t). The effect is attributed to Dzyaloshinskii–Moriya interaction which is known to be strongly dependent on the regularities of magnetic and nonmagnetic layers alternation. We emphasize that the investigated system represents an intermediate case between unalloyed multilayer films and uniformly mixed alloys. Despite that it demonstrates similar micromagnetic behavior with skyrmion density very well controllable by modulation of technological parameters.
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