Superconducting Properties of Lead-Bismuth Films Controlled by Ferromagnetic Nanowire Arrays

Superconducting properties of lead-bismuth (82{\%} Pb and 18{\%} Bi) alloy films deposited on ferromagnetic nanowire arrays have been investigated. Ferromagnetic Co or Ni nanowires are first electroplated into the columnar pores of anodic aluminum oxide (AAO) membranes. Superconducting Pb$_{82}$Bi$_{18}$ films are then quench-condensed onto the polished surface of the AAO membranes filled with magnetic nanowires. A strong dependence of the Pb$_{82}$Bi$_{18 }$superconducting properties on the ratio of the superconducting film thickness to the magnetic nanowire diameter and the material variety was observed.