Magnetic Studies of Substrate and Superconductive Materials for Development of Advanced Coated Conductors
Abstract
A scientific study has been concluded on the energy loss in advanced coated superconducting wires and tapes that arise from the presence of ferromagnetic substrate materials. Since Ni-W alloys are being used presently as substrates in prototype commercial conductors, a thorough investigation was conducted on the magnetic and loss properties of a series of Ni(sub 1-x)Wx biaxially textured alloys, for the entire range of ferromagnetism, x = 0-9 at% W. The Curie temperatures and saturation magnetization decreased linearly with W-content to a critical concentration of 9.6 at% W. The ferromagnetic loss at cryogenic temperatures was investigated as a function of composition, processing variables, magnetic field amplitude, bending deformation, and cutting operations. These studies were conducted in cooperation with the Coated Conductor development program at the Oak Ridge National Laboratory, American Superconductivity Corp., and Oxford Instruments Superconducting Technology. More recently, investigations have been initiated to understand vortex pinning and the critical current density in thin superconducting layers on "RABiTS" substrates.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 19, 2004
- Accession Number
- ADA430885
Entities
People
- James R. Thompson
Organizations
- University of Tennessee