Reliable 4.8 T trapped magnetic fields in Gd-Ba-Cu-O bulk superconductors using pulsed field magnetization

A robust and reliable in-situ magnetization method is essential for exploiting the outstanding magnetic flux trapping ability of bulk superconductors in practical applications. We report a 4.8 T peak trapped magnetic field, B-T, achieved at 30 K in a 36 mm diameter GdBa2Cu3O7-delta-Ag bulk superconductor using pulsed field magnetization (PFM). To realize this, we have developed a reliable two-step multi-pulse PFM process based on understanding and exploiting the avalanche-like flux jump phenomenon observed in these materials. The magnitude of the applied pulsed magnetic field (B-a) necessary to trap 4.8 T was merely 5.29 T, corresponding to a remarkable magnetization efficiency (B-T/B-a) of 90%.

Automated summary

The study reports a 4.8 T peak trapped magnetic field achieved in a 36 mm diameter GdBa2Cu3O7-delta-Ag bulk superconductor at 30K using pulsed field magnetization. A reliable two-step multi-pulse PFM process based on the understanding and exploitation of avalanche-like flux jump phenomenon in these materials was developed to achieve this. The applied pulsed magnetic field necessary for trapping 4.8 T was only 5.29 T, with a remarkable magnetization efficiency of 90% (BT/Ba).