[9p-A31-1~9] 11.1 Fundamental properties

3:15 PM - 3:30 PM JST(6:15 AM - 6:30 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation AwardEnglish Presentation

[9p-A31-7] Alignment kinetics of magnetic-field-induced grain alignment in (Y_1-xDy_x)Ba₂Cu₄O₈ microcrystals under modulated rotating magnetic field

〇(D)Pamoda Piyumali Kahagalla¹, Fumiko Kimura¹, Shintaro Adachi¹, Noriyuki Hirota², Tohru Suzuki², Tetsuo Uchikoshi², Shigeru Horii¹ (1.Kyoto Univ. Adv. Sci., 2.NIMS)

Keywords:

Magnetic alignment,Magnetic anisotropy,Slurry viscosity

Grain alignment using modulated rotating magnetic fields (MRFs) is a promising route toward epitaxy-free biaxial texturing of REBCO superconductors. Although triaxial alignment of REBCO materials has been demonstrated using MRFs, the alignment time required for c-axis and in-plane orientation has not been quantitatively established. In this study, the alignment kinetics of (Y_1-xDy_x)Ba₂Cu₄O₈ microcrystals dispersed in a standard-viscosity medium were investigated by in-situ X-ray diffraction under MRF as a first step toward clarifying the alignment kinetics of REBCO superconductors. Microcrystals with various Dy concentrations were dispersed in a medium with η = 140 Pa·s under an MRF of 1 T. Time-resolved 2D-XRD patterns were analyzed using azimuthal intensity profiles of the (0014) and (020) reflections to evaluate c-axis and in-plane alignment. The obtained kinetic parameters provide criteria for balancing magnetic torque with viscous resistance, enabling rational design of slurry-based, epitaxy-free biaxial texturing processes for REBCO superconductors.