A superconducting permanent magnet system capable of generating magnetic fields up to 2T has been constructed by using a c-axis-oriented Sm-based large bulk superconductor fabricated as a trapped-field magnet through the melt processing. A high magnetic field has been produced by using the pulsed-field magnetization (PFM) technique at temperatures below 80K, attained by a cryocooler and vacuum pumps. Detailed analysis of the motion of magnetic fluxes caused by the PFM revealed that the method of iteratively magnetizing pulsed-field operation with reducing amplitude (IMRA) is very effective and inevitable for magnetizing high J_c bulk superconductors at temperatures near 30K.