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In this paper, the trapped field properties of GdBaCuO disk bulk superconductors of various diameters during pulsed-field magnetization (PFM) using an identical split coil at 65 K have been investigated both experimentally and numerically. The maximum trapped field, <italic>B</italic>Tmax, of the <italic>φ</italic>43-mm bulk was larger than that of the <italic>φ</italic>30-mm bulk. However, <italic>B</italic>Tmax of the <italic>φ</italic>65-mm bulk was smaller than that of the <italic>φ</italic>43-mm bulk and the trapped field profile exhibited a distorted “C-shaped” profile. Using the numerical simulation, these results for the <italic>φ</italic>65-mm bulk can be explained by an inhomogeneous temperature profile and the larger generated heat, <italic>Q</italic>, due to the lower cooling power of the refrigerator compared to the generated heat. The important issues to achieve higher and homogeneous trapped fields are discussed when using split-coil PFM for larger bulks.

Trapped Field Properties of GdBaCuO Bulk Superconductors of Various Diameters Magnetized by Pulsed Fields Using an Identical Split Coil