Magnetization characteristics of YBaCuO bulk material fabricated by the seeding technique

YBaCuO (YBCO) bulk materials with large superconductive domains were fabricated using a small SmBa2Cu3Ox 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 and ac susceptibility. The strong flux pinning made it possible for the large YBCO bulk to capture a great deal of flux and keep the residual magnetism stable. The residual field intensity Hrem 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 Hrem in a short time. The magnetized YBCO bulk produced 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.