Experimental investigation reveals asymmetric flux pinning in nanostructured ferromagnetic-superconducting bilayers, indicating that magnetic forces dominate pinning potentials.
We investigated the pinning of flux lines in a superconducting film by a regular array of magnetic antidots . The sample consists of a Co/Pt multilayer with perpendicular magnetic anisotropy in which a regular pattern of submicron holes is introduced and which is covered by a type-II superconducting Pb film. The resulting ferromagnetic/superconducting heterostructure shows a pronounced asymmetric magnetization curve with respect to the field polarity. This asymmetry clearly demonstrates that the magnetic contribution dominates the pinning potential imposed by the magnetic antidots on the superconducting film.
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Lange et al. (2001) studied this question.
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