Title :
Characteristics of YBaCuO magnetic shields
Author :
Hurben, M.J. ; Symko, O.G. ; Yeh, W.J. ; Kulkarni, S. ; Novak, M.
Author_Institution :
Dept. of Phys., Utah Univ., Salt Lake City, UT, USA
fDate :
3/1/1991 12:00:00 AM
Abstract :
Magnetic shielding properties of YBaCuO tubes have been studied at temperatures of 77 K and 4 K. Shielding effectiveness was determined by measuring the magnetic field inside the tube in the presence of external magnetic fields. A high degree of shielding was achieved up to a critical external field determined by the critical current density of the material. Typically, this critical field is 23 Oe at 77 K extending up to 105 Oe at 4 K. Tubes made with material containing 10% silver exhibited much stronger flux pinning behavior when the external magnetic field started to penetrate the tubes. The tubes studied were effective in shielding a RF-biased SQUID (superconducting quantum interference device) for operation at 77 K
Keywords :
SQUIDs; barium compounds; critical current density (superconductivity); flux pinning; high-temperature superconductors; magnetic shielding; yttrium compounds; 4 K; 77 K; RF-biased SQUID; YBaCuO magnetic shields; critical current density; critical external field; flux pinning behavior; high-temperature superconductor; magnetic shielding properties; Critical current density; Magnetic field measurement; Magnetic flux; Magnetic materials; Magnetic properties; Magnetic shielding; SQUIDs; Superconducting magnets; Temperature; Yttrium barium copper oxide;
Journal_Title :
Magnetics, IEEE Transactions on
