Pulse-Field Magnetization for Disc-Shaped MgB2 Bulk Magnets

Taisuke Miyazaki, Satoshi Fukui, Jun Ogawa, Takao Sato, Tetsuo Oka, Juliane Scheiter, Wolfgang Hasler, Eranda Kulawansha, Zhao Yuanding, Kazuya Yokoyama

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

MgB2 bulk magnets are one of the attractive bulk superconductors because they have homogeneous trapped field distribution, low material costs, lightweight, and so on. Pulse-field magnetization (PFM) also has some effective advantages in the point of view of compact setup, shorter magnetizing time, and an inexpensive way to magnetize the bulk samples. However, the trapped field by PFM is inferior to those by field cooling magnetization due to the heat generation caused by sudden changes of the magnetic flux motion. Especially, the temperature rise is remarkable for MgB2 bulk magnets because of its low specific heat. In this study, we have carried out the PFM technique for five-stacked or three-stacked MgB2 bulk samples to analyze the flux-invasion behavior. These samples were fabricated by ball-milling and hot-pressing. As a result, maximum trapped field of BT = 0.64 T was obtained at 14.6 K at the center of the topmost sample when the external magnetic field Bex of 0.90 T was applied. As Bex increases further, BT were dramatically decreased because of heat generation. Furthermore, flux jumps frequently took place in the applied field higher than 2.0 T.

Original languageEnglish
Article number7782353
JournalIEEE Transactions on Applied Superconductivity
Volume27
Issue number4
DOIs
Publication statusPublished - 2017 Jun 1
Externally publishedYes

Keywords

  • Bulk magnet
  • flux jump
  • MgB
  • pulsed-field magnetization
  • trapped field

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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    Miyazaki, T., Fukui, S., Ogawa, J., Sato, T., Oka, T., Scheiter, J., Hasler, W., Kulawansha, E., Yuanding, Z., & Yokoyama, K. (2017). Pulse-Field Magnetization for Disc-Shaped MgB2 Bulk Magnets. IEEE Transactions on Applied Superconductivity, 27(4), [7782353]. https://doi.org/10.1109/TASC.2016.2639298