MAGNETIZATION CHARACTERISTICS OF YBaCuO BULK MATERIAL FABRICATED BY THE SEEDING TECHNIQUE

YBaCuO (YBCO) bulk materials with large superconductive domains were fab-ricated using a small SmBa₂Cu₃O_x grain as the seed for growth, The capacities of strong flux pinning and well grain linking in the material have been shown in the investigations on magnetization loop end ac susceptibility. The strong flux pinning made it possible for the large YBCO bulk to capture a great dea. l of flux and keep the residual magnetism stable. The residual field intensity H_rem was shown to have a maximum of 0.125 T after the 0.5 T NdFeB magnetizing field was moved away. We did not find much decline of H_rem in a short time. The magnetized YBCO bulk pro-duced repulsive force upon another YBCO bulk as the permanent magnet did. We measured and calculated the force between two YBCO bulks. The theoretical result was in agreement with the experimental one by and large.