Presentation Information
[WBP2-23]Influence of Dy concentration and Dispersion medium on low-field Magnetic alignment of (Y1-xDyx)Ba2Cu4O8
*Pamoda Piyumali Kahagalla Kahagalla Gamaralalage1, Fukuyama Fuuto1, Fumiko Kimura1, Shigeru Horii1 (1. Kyoto University of Advanced Science (Japan))
Keywords:
Magnetic alignment,Triaxial grain orientation,Viscosity of the dispersion medium
This study investigates the effects of Dy3† substitution (0 ≦ x ≦ 1) and dispersion medium viscosity on the low−field (Ba=0.8 T) magnetic alignment of (Y1−xDyx)Ba2Cu4O8 powders. Grain boundary misorientation in cuprate−based high−temperature superconductors (HTSCs) limits inter−grain critical current density (Jc), making triaxial grain alignment along the c−axis and ab−plane crucial. Magnetic alignment offers a cost−effective alternative to epitaxial growth, exploiting the intrinsic magnetic anisotropy (Δχ) of HTSCs. Single crystals were grown via the KOH flux method. Magnetic alignment was performed for the pulverized samples dispersed in two types of epoxy resins (∼40 Pa.s and ∼0.5 Pa.s) under modulated rotating magnetic fields (MRF) via a superconducting solenoidal magnet with a sample rotation system. Magnetic aligned samples were evaluated using powder X−ray diffraction and (017) pole figure measurements. Results show that low−viscosity epoxy enabled effective triaxial alignment even at lower x levels, whereas high−viscosity epoxy limited alignment to the c axis at lower x, due to the imbalance between orientation time and curing time. Increasing Dy concentration further enhanced alignment by increasing the triaxial magnetic anisotropy. These findings highlight the critical interplay between Δχ and dispersion medium viscosity in achieving low−field triaxial grain orientation, providing guidance for scalable fabrication of high Jc HTSC films.