Trapped Fields >1 T in a Bulk Superconducting Ring by Pulsed Field Magnetization

One potential application of magnetized RE-Ba-Cu-O (where RE = rare earth or Y) bulk superconductors is as a high-field alternative to conventional permanent magnets in desktop NMR and MRI systems. Pulsed field magnetization (PFM) one the most promising practical methods magnetizing such bulks. However, trapped fields obtained by PFM are much lower than those using quasi-static like field-cooling (FCM) due heating during PFM. Furthermore, superconducting rings have proved more difficult magnetize via discs. The reported single less 0.35 T at centre bore thermomagnetic instabilities. In this work, systematic measurements on Gd-Ba-Cu-O ring were carried out 1.3 55 K was achieved multi-pulse, stepwise cooling (MPSC) method. MPSC method, sequence pulsed used bulk. increased small increments sample temperature decreased sequentially. Consequently, some already after first pulse, motion flux for subsequent pulses will be reduced, leading heat generated sample. This greatly improves stability process, enabling larger fields.