Pulsed Field Magnetizing Behavior of Gd-Ba-Cu-O Bulk Superconductor With a Superconducting Joint

In this study, conditions for obtaining high-quality superconducting joint to a Gd-Ba-Cu-O bulk superconductor to investigate for the first time the effect of pulse field magnetization (PFM) properties of the joined bulk and to study an effective pulse magnetization method. We fabricated a good superconducting joint using the local melting method with sintered Er-Ba-Cu-O and applied the PFM method to the joined bulk. As a result, a high magnetic field of 1.2 T was trapped in the joined part when the magnetic field strength more than 5 T was applied at 50 K. From the evaluation results of the
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characteristics of each region cut from the joined sample confirmed that the joined sample was efficiently magnetized due to the preferential field penetration path and the dispersion of heat generation from the joined part. This is a finding that could lead to the future use of PFM in the bulk using superconducting joint with minimal reduction of the trapped magnetic field, and could simplify the magnetization method, which has been a drawback of PFM.