Abstract
Pulsed field magnetization (PFM) is considered as the most effective method for magnetizing high temperature superconducting (HTS) bulks. Applying ferromagnetic materials around HTS bulks during PFM can increase their trapped field. This work proposes four ferromagnetic structures (disk, bottom ring, side ring, and bowl types) combined with HTS bulk. The trapped field and temperature are calculated in the HTS bulk with different ferromagnetic structures. The results show that the bowl type has the most significant ability to capture the magnetic field, while the bottom ring type has the smallest one. Compared with the trapped field of single bulk, the trapped field of the bowl type is increased by about 24% under the same PFM condition, and the temperature rise is also significantly decreased. In addition, the effects of different thicknesses of the ferromagnet on the trapped field and maximum temperature of bulk are also investigated. As the thickness of the ferromagnetic structure enlarges, the maximum temperatures of the disk and bottom ring increase, while the side ring and the bowl decrease.
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