Comparison of pulsed magnetization processes for HTS bulk parts

With respect to the potential application as cryo-permanent magnets, melt-textured YBaCuO bulk parts were used to investigate various pulsed magnetization processes employing pulsed copper coils. Results for different multi-pulse processes including different peak fields, pulse durations, temperatures and geometries are compared. The strong current-carrying capabilities of HTS material, even for currents above the critical current Jc, result in strong shielding effects, in particular for short pulse durations. It turns out that the inhomogeneities present in all real materials play an important role for the initial magnetic flux penetration. To fully magnetize the bulk samples, the non-stationary conditions and geometrical effects require peak fields, which substantially exceed twice the saturation magnetization measured at the sample surface. Transient magnetizations as well as shapes and absolute values of trapped flux profiles are reported.