Vortex Pinning by an Inhomogeneous Magnetic Field

We discuss the transport properties of a superconducting film under the influence of a tesla range spatially alternating magnetic field created by magnetic nanostructures placed outside a superconducting film with an insulating barrier between both so that they interact only via the magnetic field. A simple model for pinning by the spatially periodic magnetic field from the magnetic nanostructure qualitatively describes the data.