Co ball Nb film heterostructure superconducting material and preparation method thereof

The invention discloses a Co ball Nb film heterostructure superconducting material which comprises a substrate, an Nb film and a Co hollow ball array film. The Nb film is located on the substrate, and covered with the Co hollow ball array film. The Co hollow ball array film is of a hexagonal honeycomb array formed by tightly arraying a plurality of Co hollow balls layer by layer. According to the Co ball Nb film heterostructure superconducting material, a magnetic Co material and an Nb superconducting film material form the heterostructure nanostructured material, the superconducting transformation temperature and critical current density can be adjusted and controlled by an applied magnetic field or electric field, and therefore the superconductivity of the Nb film is adjusted and controlled through the magnetic domain form. The invention further discloses a preparation method for the Co ball Nb film heterostructure superconducting material.