Recent progress in melt processing has enabled us to fabricate large grain RE-Ba-Cu-O (RE: rare earth elements) superconductors with high critical current density (J_c) values [1]. Such bulk superconductors can exhibit a large electromagnetic force through the interaction with magnetic fields [2]. A significant large magnetic field over several teslas can also be trapped by a large single grain superconductor exhibiting high J_c values [3]. Such trapped field magnets are attractive for various applications, since they can generate fields much higher than those of permanent magnets in almost the same dimensions.
展开▼
