Field dependence of trapped fields in (Nd, Eu, Gd)-Ba-Cu-O bulk superconductors

Magnetized high-T-c superconducting discs and rings offer the opportunity t o produce much stronger magnetic fields than conventional permanent magnets . In this study single-domain (Nd, Eu, Gd)-Ba-Cu-O bulk samples have been f abricated with various NEG-211 contents. The maximum trapped fields of melt -grown blocks were measured as a function of external field and compared wi th the J(c)-B properties of small specimens. Both measurements showed a sim ilar field dependency, which implies that the same pinning mechanism is act ive even in large melt-grown blocks.