講演情報
[15p-S2_201-4]Magnetic Alignment Behavior of (Y1-xDyx)Ba2Cu4O8 under LDT-MRF
〇(B)AHMED Muhammad Afiq1, K.G.P.P. Kahagalla1, F. Fukuyama1, S. Adachi1, F. Kimura1, S. Horii1 (1.Kyoto Univ. Adv. Sci)
キーワード：
Superconductivity
Rare-earth based cuprate superconductors are promising candidates for applications at 77 K; however, grain-boundary misorientation severely degrades the critical current density, requiring bi- or triaxial grain alignment for practical use. Magnetic alignment using modulated rotating magnetic field (MRF) offers a cost-effective, room-temperature alternative to conventional alignment techniques. In this study, triaxial magnetic alignment using a linear-drive type MRF (LDT-MRF) was applied to twin-free (Y, Dy)124, which allows systematic control of magnetic anisotropy (Δχ) through Dy substitution. By varying Dy concentration and analyzing grain orientation of magnetically aligned sample at different positions within permanet magnet based array, a pronounced position dependence of in-plane alignment was revealed. Dy-doped samples exhibited enhanced sensitivity to spatial variations of the rotating magnetic field, particularly near the array edge of the magnet array. These results clarify intrinsic spatial nonuniformity of MRF and effective alignment limits of the LDT-MRF system, providing insight for scalable bi-/triaxial grain alignment of REBCO materials.