Trapped magnetic field of a mini-bulk magnet using YBaCuO at 77 K

Melt-processed rare earth (RE) 123 superconductors have a high J(c) at 77 K and high magnetic field. Solidification processes for producing (L)RE123 s uperconductors and pinning centers in the (L)RE123 matrix are effective for obtaining high J(c), leading to high-field application as a superconductin g quasi-permanent bulk magnet with the liquid nitrogen refrigeration. One o f the promising applications is a superconducting magnet for the magnetical ly levitated train. We fabricated a mini-superconducting bulk magnet of 200 x 100 mm(2), consisting of 18 bulks, which are a square 33 mm on a side an d 10 min in thickness, and magnetized the mini-magnet by field cooling. The mini-magnet showed the trapped magnetic field of larger than 0.1 T on the surface of the outer vessel of the magnet. The present preliminary study di scusses trapped magnetic field properties of the mini-bulk magnet using YBa CuO superconductors at 77 K. (C) 2001 Elsevier Science B.V. All rights rese rved.