Measurement of Magnetization Property of Bulk High-T_c Superconducting Magnet by Pulse Magnetic Field

Abstract

We studied pulse magnetic field using a small coil to magnetization of the high-T_c superconductor (HTSC), and assessed its pulse magnetization property. Because the HTSC bulk material has grains of various sizes, its magnetic properties are not uniform. Therefore, it is important for application of the HTSC to develop a nondestructive measurement method in order to evaluate characterization of magnetic properties of the superconducting bulk materials. We developed a magnetic field visualization system that enables to measure magnetic field using a Hall device probe and that produces visual images of the magnetic field on a computer display. The domains of large value of magnetization coincide with those of the grains. And we can see that the negative magnetic field is around the domain of the large magnetization value. Pulse magnetization method using the small coil can magnetize the HTSC without the field-cooling.