Enhancement of trapped field of REBCO bulk in a desktop-type magnet system

K. Yokoyama, T. Oka

Research output: Contribution to journalArticlepeer-review


Wedeveloped a desktop-type bulk magnet system using a Stirling refrigerator and used it to study how to improve the trapped field by pulsed field magnetization (PFM). Although PFM has the advantage that the bulk is activated in a few seconds using an ordinary inexpensive equipment, the amplitude of a trapped field is low as compared with the maximum performance of the material. This paper aims to improve the trapped field by changing the size of soft-iron yoke, which are generally used to extend the pulse width. When a φ60-mm GdBCO bulk was magnetized using φ64-mm and φ80-mm yokes, the maximum flux density and total magnetic flux of large yoke were 13% and 23% higher than those of small one, respectively. Moreover, improvement of trapped field by multi PFM was investigated. When a magnetic field of 5.8 T was applied twice, the maximum trapped field of 1.46 T and the total magnetic flux of 1.86 mWb were achieved.

Original languageEnglish
Article number025053
JournalEngineering Research Express
Issue number2
Publication statusPublished - 2019 Dec


  • Pulsed field magnetization
  • REBCO bulk
  • Soft-iron yoke
  • Stirling refrigerator

ASJC Scopus subject areas

  • Engineering(all)


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