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The compact magnet for NMR device that consists of a stacked high temperature superconducting (HTS) Gd–Ba–Cu–O bulk annuli was trapped by a field cooling method. However, it was difficult to trap the uniform magnetic field above 4.7 T (200 MHz-class NMR magnet) and field homogeneity under 0.01 $\hbox{ppm/cm}^{3} $ at liquid nitrogen temperature (77.4 K) because of the low Jc–B characteristics of...
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