Abstract
We report the generation of skyrmions under the combined influence of applied perpendicular magnetic fields and electrical currents in Pt/Co/Os/Pt thin films. Under no electrical current, skyrmions are found to nucleate at specific defect sites distributed throughout the film and remain pinned at these sites for small dc electrical currents $(l0.05\mathrm{MA}/\mathrm{c}{\mathrm{m}}^{2})$ . For larger currents $(l0.05\mathrm{MA}/\mathrm{c}{\mathrm{m}}^{2})$, skyrmions can either move or elongate in the direction of the current flow to form stripe domains. We further observed the current-induced generation of skyrmions through two specific processes: (i) stripe domains depinning from defect sites and collapsing into skyrmions, or (ii) skyrmions breaking off from pinned stripes; the rate of these stripe-to-skyrmion creation phenomena is proportional to the applied current density. Additionally, we observe a sudden increase in the skyrmion population immediately after the applied current is removed----a behavior attributed to stripe domains previously elongated by the electrical current collapsing back into skyrmions.
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