Abstract
The trapped field BT and temperature rise ΔT on a large GdBaCuO superconducting bulk (65 mm in diameter) have been investigatedduring pulse field magnetization (PFM), and compared with those on GdBaCuObulk with a diameter of 45 mm. The maximum trapped field at the bulk centerBT(C) on theϕ 65 mm bulk is assmall as 1.9 T at Ts = 40 K for the single pulse field application ofBex = 6.7 T, which is smallerthan that of the ϕ 45 mm bulk (BT(C) = 3.2 T). Thetotal trapped flux ΦT on the ϕ 65 mm bulk is, however, about twice as large as that on theϕ 45 mm bulk. The magnetic fluxes cannot sufficiently intrude into the center of theϕ 65 mmbulk at Ts = 40 K for pulse field applications up to 6.7 T, whereas a large number of the magnetic fluxes aretrapped at the peripheral region of the bulk. The trapped field characteristics for bothbulks with different diameters can be roughly interpreted by a simple critical state modelunder zero field cooling (ZFC).
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