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Vortex manipulation in superconducting films with tunable magnetic topology

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Abstract:

Using a combination of the phenomenological Ginzburg–Landau theory and micromagnetic simulations, we study properties of a superconducting film with an array of soft magnetic dots on top. An external in-plane magnetic field gradually drives the magnets from an out-of-plane or magnetic vortex state to an in-plane single-domain state, which changes spatially the distribution of the superconducting condensate. If induced by the magnets, the vortex–antivortex molecules exhibit rich transitions as a function of the applied in-plane field. At the same time, we show how the magnetic dots act as very effective dynamic pinning centers for vortices in an applied perpendicular magnetic field.

Document Type: Research Article

DOI: http://dx.doi.org/10.1088/0953-2048/24/2/024001

Publication date: February 1, 2011

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