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Vortex Confinement in Planar Superconductor/Ferromagnet Hybrid Structures

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9 Author(s)
Iavarone, M. ; Phys. Dept., Temple Univ., Philadelphia, PA, USA ; Scarfato, A. ; Bobba, F. ; Longobardi, M.
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We use low temperature magnetic force microscopy and global magnetometry measurements to study the influence of magnetic domains on the Abrikosov vortex pinning in planar superconducting/ferromagnet bilayers. The superconducting/ferromagnet bilayers consist of a 200 nm superconducting Nb film covering a Permalloy film, with an insulating layer in between to avoid proximity effect. The periodic stripe domain in the Permalloy film produces a potential for directing vortex motion in the adjacent superconducting film. We observed an enhancement of vortex pinning by a factor of 3 that occurs in bilayers with a magnetic stripe domains w ≈ 500 nm, close to the superconducting critical temperature (T/Tc = 0.9) . At lower temperatures, when T/Tc = 0.6 the channeled vortex motion and the intrinsic pinning favor vortex avalanches.

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Magnetics, IEEE Transactions on  (Volume:48 ,  Issue: 11 )