Biaxial alignment of DyBa₂Cu₃Oy superconductor by linear drive type modulated rotating magnetic field

Linear-drive type modulated rotating magnetic field (LDT-MRF) equipment enables generation of MRF by the reciprocation motion of magnet array without using the control of sample rotation. Biaxial alignment of DyBa 2 Cu 3 O y (y∼7) with twin microstructures was examined by LDT-MRF with three different magnet arrays, and we compared their orientation degrees. Clear difference in the orientation degrees appeared among the three magnet arrays. The electromagnetic simulation by the finite element method revealed the position dependence of distribution of magnetic flux lines, and specifications of MRF were determined. The three magnet arrays showed similar values on averaged rotating magnetic field component and averaged static field component. However, it was found that the magnet array with the lowest biaxial orientation degree showed the minimum rotating magnetic field component with a level of 0.5 T. This value was obviously lower than those in the other two magnet arrays. The present study proposed that the analysis by using the simulation is important to develop the magnet array with desirable specifications.