Shielding and Trapped Field Properties of Large MgB2 Bulk

We have studied the magnetic shielding properties of MgB2 bulk fabricated by a reactive liquid Mg infiltration (Mg-RLI) method. The magnetic shielding profiles indicated partially field-penetrated areas at the bulk periphery with weaker pinning force at 38 K. We discuss about the superconductive inhomogeneity in the bulk by comparing the shielding profiles with trapped field ones by the subsequent zero-field-cooled magnetization (ZFCM) and the pulsed-field magnetization (PFM). The present method is advantageous to detect the inhomogeneity at the periphery of a large superconducting bulk.