Abstract
Superconducting permanent magnet systems generating magnetic fields of 2–5 T have been constructed for the first time in the world by c-axis oriented Sm–Ba–Cu–O bulk superconductors fabricated through the melt processing as trapped field magnets. The trapped magnetic fields of 3.8 and 6.7 T have been produced on the bulk surface at 30 K by the pulsed field magnetization (PFM) and field cooling (FC) methods, respectively. The magnetic field in the open space outside the vacuum vessel exceeds 2.0 and 3.2 T when magnetized by the PFM and FC modes, respectively. It was found that the iteratively magnetizing pulsed-field operation with reducing amplitudes (IMRA method) is very effective in magnetizing high J c bulk superconductors. This implies the superconducting permanent magnets can be used as high magnetic field generators in various practical applications.
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