We have investigated the trapped field characteristics of a rectangular-shaped Gd-Ba-Cu-O bulk (33 x 33 x 15 mm 3) magnetized by pulsed field magnetization (PFM) using split-and solenoid-type coils. A soft iron yoke was set below the bulk for the solenoid coil and two yokes are inserted in the bores of the split coil. The maximum trapped field, B Zmax , at the center of the bulk surface was 1.73 T at 40 K in the case of the solenoid coil, with a distorted profile. On the other hand, B Zmax was enhanced to 3.05 T at 40 K for the split coil with two yokes, for which a symmetric trapped field profile was observed. The behavior of the magnetic flux motion indicated two conditions for the enhancement of the trapped field: that the magnetic flux intrudes easily into the bulk even for lower applied fields and then saturates with minimal flux creep. We also have investigated the electromagnetic and thermal properties of the bulk during PFM using a numerical simulation, in which the magnetic flux tended to align along the z-axis due to the presence of the soft iron yoke. The use of the split coil with two yokes is effective in enhancing the trapped field for the rectangular-shaped bulks. Index Terms-(RE) BaCuO bulk, pulsed field magnetization, numerical simulation, trapped field, soft iron yoke I. INTRODUCTION ULSED FIELD MAGNETIZATION (PFM) of (RE)BaCuO bulks (RE: rare earth element or Y) has been investigated intensively for practical applications as a substitute for fieldcooled magnetization (FCM) because PFM is an inexpensive and mobile experimental setup with no need for a superconducting magnet. However, the trapped field, B Z , by PFM is generally lower than that by FCM, where B Z values over 17 T have been achieved [1], because of the large temperature rise caused by the dynamical motion of the magnetic flux [2]. To enhance B Z by PFM, multi-pulse techniques using a solenoid coil are usually effective due to the reduction of temperature rise [3-6]. Using a new multipulse techniquethe so-called modified multi-pulse technique with stepwise cooling (MMPSC)we successfully achieved a highest trapped field of B Z = 5.20 T on a 45 mm Gd-Ba-Cu-O bulk disk at 30 K, which is a record-high value to date [7]. In addition, the use of new types of coils, such as a split coil