Abstract
We have observed the evolution of phase diagram and vortex pinning using a single ferromagnet/superconductor bilayer of ${[\text{Co}/\text{Pt}]}_{8}/\text{Nb}$ through a special demagnetization procedure. It induces a continuous and reversible change in the domain width with equal positive/negative domains enabling the observation of the predicted tunable phase diagram. The tunable domain pattern also systematically affects vortex pinning. We have determined the dependence of the activation energy of vortex pinning on domain width, temperature, and magnetic field.
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