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• W2042010544 abstract "We investigate the flux pinning and dynamic properties of superconducting vortices in an Al film with an array of magnetic bars deposited on top. The dimensions of each bar are chosen in such a way that they host a single magnetic domain. These micromagnets are distributed periodically in a rectangular array with 0.5 µm separation parallel to the longest side of the bars and displaced laterally by a distance w. We show that, for w>Λ, where Λ is the effective field penetration depth, the pinning strength is almost independent of w whereas the critical temperature at zero field, Tc(0), decreases as ∼w−1. For w<Λ the opposite behavior is observed, i.e. Tc(0) seems to saturate to a nearly w-independent value and the transition from large to small w is accompanied by a large suppression of the critical current jc together with a clear change in the shape of the current–voltage characteristics. In particular, the substantial weakening of the pinning potential for w<Λ gives rise to an unexpected flux flow response. The field evolution of this regime allows us to determine whether the magnetic bars induce vortex–antivortex pairs in the system. The present findings suggest that practical application of magnetic pinning centers are restricted to low field values." @default.
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• W2042010544 date "2009-01-28" @default.
• W2042010544 modified "2023-09-23" @default.
• W2042010544 title "Pinning centers produced by magnetic microstructures" @default.
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• W2042010544 doi "https://doi.org/10.1088/0953-2048/22/3/034002" @default.
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