Electromagnetic interaction of electrodeposited nickel nanowires with a niobium thin film

Abstract

In this paper we present superconducting properties of a Nb thin film deposited on an array of ferromagnetic (Ni) nanowires embedded in a porous template. By investigating he Tc(H) phase boundary and by measuring V(I) characteristics and critical currents as a function of the applied magnetic field, we find that the Nb film exhibits properties similar to those of a network of one-dimensional superconducting nanowires. We attribute this behavior to the stray fields of the magnetic dipoles, which create an almost regular lattice of normal regions in the superconductor, ultimately changing its topology.