Recent Progress of  $\hbox{MgB}_{2}$ Bulk Magnets Magnetized by Pulsed Field
A MgB<sub>2</sub> superconducting bulk has a promising potential as a quasi-permanent magnet. In this paper, we have performed pulsed-field magnetization (PFM) at T<sub>s</sub> = 14-20 K for MgB<sub>2</sub> superconducting bulks with a higher critical current density J<sub>c</sub>(B) fabricated by hot isostatic pressing. During PFM, a flux jump frequently took place, and trapped field B<sub>z</sub> decreased in the disk-shaped bulks for a higher magnetic field application. However, in the cylindrical bulk with identical J<sub>c</sub>(B) characteristics, the flux jump was avoided, and a maximum trapped field of Bz = 0.81 T was obtained at 14 K, which is a record-high trapped field in a MgB<sub>2</sub> bulk by PFM. The electromagnetic and thermal instability was discussed using conventional relations to avoid the flux jump and to enhance the trapped field on the MgB<sub>2</sub> bulks with higher J<sub>c</sub>(B), higher thermal conductivity, and lower specific heat.