Patent ID: 8148301
Filing Date: 2012-04-03
Classification: B24B,H01L,Y10S

Abstract:
1. A method of polishing a target surface of a tape-shaped substrate, wherein said tape-shaped substrate, an intermediate layer that is formed on said tape-shaped substrate and an oxide superconductor thin film layer that is formed on said intermediate layer form an oxide superconductor member, said method comprising a polishing step of polishing said target surface while continuously running said tape-shaped substrate in a specified direction, said polishing step including an initial polishing process of carrying out random rotary polishing of said target surface of said tape-shaped substrate in at least one stage and thereby removing surface scratches formed by a rolling process and crystalline defects of said tape-shaped substrate and a finishing process of polishing said target surface of said tape-shaped substrate in said specified direction in at least one stage and thereby finishing said target surface into a smooth and flat surface, wherein the average surface roughness Ra of said target surface becomes 2 nanometer or less and the in-plane directionality Δφ of said intermediate layer becomes 5° or less after said polishing step.