Higher trapped field over 5 T on HTSC bulk by modified pulse field magnetizing

The trapped field B-T(P) = 5.20 T has been realized on the GdBaCuO bulk superconductor by a modified multi pulse technique combined with a stepwise cooling (MMPSC), which surpassed the previous highest record of B-T(P) = 4.47 T. At the first stage, a small amount of the magnetic field similar to 1 T was trapped at the bulk center with a concave field distribution at a high starting temperature T-S similar to 45 K by the low pulse field application B-ex similar to 4.5 T. Following the first stage, the higher field of B-ex similar to 6.7 T was applied at a lower T-S similar to 30 K at the second stage. The concave trapped field profile over the bulk at the first stage and the optimization of the higher applied pulse field at the second stage are key points to enhance B-T above 5 T. (c) 2006 Elsevier B.V. All rights reserved.