Magnetic field distributions of stacked large single domain Gd–Ba–Cu–O bulk superconductors exceeding 140 mm in diameter

Abstract

We have studied the magnetic field distribution of the stacked two single domain Gd–Ba–Cu–O large bulk superconductors exceeding 140mm in diameter, and compared with the distribution of one single domain bulk. The maximum trapped magnetic field of the stacked bulk at 65K was 4.3T and 5T at the surface and at the center of two large bulks respectively, when the bulks were field-cooled in 5T. It was found that the magnetic field could reach a longer distance and wider area by increasing the thickness. Therefore, larger and thicker bulk superconductor shows several benefits in terms of practical applications.