Influence of Jc(B, T) Characteristics on the Pulsed Field Magnetization of REBaCuO Disk Bulks

The trapped field properties during pulsed-field magnetization (PFM) have been investigated numerically using three different assumptions relating to the J c (B, T) characteristics (Jirsa, Kim, and Bean models) and compared with experimental results. The trapped field properties using the Jirsa model with the so-called "peak effect," in which a realistic J c (B, T) is assumed, rather than the Kim model, result in a more realistic numerical simulation. The trapped field properties using a Kim model with a monotonically decreasing J c (B) also show similar results to those using the Jirsa model. The trapped field properties using a Bean model, for which J c is independent of magnetic field, are not necessarily enhanced because of a larger temperature rise. The numerical results suggest it is necessary to fabricate REBaCuO bulks with J c (B, T) characteristics with moderate magnetic field and temperature dependences to enhance the trapped field by PFM.