Temperature-Dependent Trapped Magnetic Fields for REBa2Cu3Oy (RE : Y, Dy) Melt-Textured Bulks Prepared Using the Single-Direction Melt Growth Method

The performance of REBCO melt-textured bulks at middle temperatures, 20-60 K is becoming more important for their high field applications, while most evaluations have focused on trapped field properties under liquid nitrogen immersion, at 77.3 K, due to the ease of measurement. In this study, YBCO and DyBCO disk-shaped bulks were fabricated using the Single-Direction Melt Growth (SDMG) method, and their field-trapping properties at middle temperatures were evaluated for the first time. SDMG bulks exhibited excellent trapped field properties at middle temperatures as well as at 77.3 K compared to those of the conventional top-seeded bulks. Additionally, two-dimensional trapped field distributions at mid to low temperatures were evaluated above the surface of the SDMG bulk using a rotating Hall sensor array, revealing minimal changes in the shape of distribution at low temperatures compared to that at 77.3 K.