US Patent 7772157 - High critical current density superconducting film

http://ip.com/patent/US7772157

This patent from Japan Science and Technology Agency is based on the finding that the formation of nanogrooves in a superconducting film can increase the critical current density at which superconductivity   holds. Claim 1 reads:

1. A superconducting film comprising:

a substrate having a surface;

a superconductor layer formed on said surface of the substrate;

nano grooves formed in said substrate, the nano grooves having a defined width and defining a current flowing direction when current flows through the superconductor layer;

rows of defect inducing parts formed in the nano grooves; and

two-dimensional crystal defects in the superconductor layer on the defect inducing parts.