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Ring-shaped REBa2Cu3Oy melt-textured bulks have been successfully grown bythe Single-Direction Melt Growth (SDMG) method, which enables the directfabrication of uniform bulks with high reproducibility. Three homogeneousDyBa2Cu3Oy ring-bulks with various sizes were synthesized in this study. All ofthese bulks exhibited concentrically cone-shaped trapped field distribution onthe surface and high trapped field more than 1.8 T at 77 K inside the ring, thehighest among bulks of comparable size to date. Furthermore, superconductingproperties such as superconducting transitions and critical current densitiesare highly uniform throughout the bulk, confirming the effectiveness of theSDMG approach. Our findings represent a significant advancement in the directfabrication of high-quality ring-shaped REBCO bulks suitable for high magneticfield applications, in particular, compact nuclear magnetic resonance systems.

Direct fabrication of high-quality ring-shaped REBa2Cu3Oy bulk magnets by the Single-Direction Melt Growth (SDMG) method