Direct fabrication of high-quality ring-shaped REBa2Cu3O y bulk magnets by the single-direction melt growth (SDMG) method

Abstract

Abstract Ring-shaped REBa2Cu3O y melt-textured bulks have been successfully grown by the single-direction melt growth (SDMG) method. Three homogeneous DyBa2Cu3O y ring-bulks were directly grown in this study, which exhibited concentrically cone-shaped trapped field distribution on the surface and a high trapped field of 1.84 T at 77 K inside the ring, the highest ever value among reported ring-shaped bulks to date. Furthermore, superconducting properties such as superconducting transitions and critical current densities are highly uniform throughout the bulk, confirming the effectiveness of the SDMG approach. Our findings represent a significant advancement in the fabrication of high-quality bulks suitable for various magnetic applications.