Study on the PFM Behavior of GdBCO Bulk Joined by ErBCO and Its FEM Simulation

The electromagnetic and thermal behavior of pulsed field magnetization (PFM) of a superconducting joined bulk was confirmed in detail by FEM simulations. It was shown that when the joined bulk is magnetized by PFM, the joined part may become the preferential field penetration path due to the difference in superconducting properties between the matrix and the joined part. However, the actual experimental system only observes the behavior of the magnetic field outside the bulk, and the details are largely based on predictions. In the actual experiments, GdBCO was selected as the matrix and ErBCO was selected as the joined part for the superconducting joint. The joined sample was cooled to 50 K and subjected to an applied magnetic field of 5 T in the PFM. FEM simulations were performed to simulate the experiments in this study. By using
J
_c
values derived from actual measurements in the simulations, the magnetic field and thermal behavior were simulated, and it was confirmed that the joined part was the preferential field penetration path as in the experiment. In addition, the magnetic field distribution with and without joining confirms that the local melting method has no effect on the property degradation in increasing the size of the joined bulk. In addition, this system made it possible to confirm the magnetic and thermal behavior even when different REBCO materials are introduced.