We have investigated the upper critical magnetic field Hc2, the critical current density Jc, and the pinning force Fₚ in sputtered Nb/Pd multilayers, varying the temperatures $T,$ the Pd thicknesses dPd and the magnetic field H orientation (parallel and perpendicular to the plane of the sample). In perpendicular fields, the vortex dynamics was strongly influenced by grain-boundary pinning. In parallel fields, a peak was observed in the Jc(H) curves for samples with Pd thicknesses dPd>100. After comparing the experimental results with the existing theories, we have related the presence of this peak effect to the matching of vortex kinks with the layered artificial structure.
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Coccorese et al. (1998) studied this question.
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