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

doi:10.1109/TASC.2016.2639298

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 journal › Article

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 B_T = 0.64 T was obtained at 14.6 K at the center of the topmost sample when the external magnetic field B_ex of 0.90 T was applied. As B_ex increases further, B_T were dramatically decreased because of heat generation. Furthermore, flux jumps frequently took place in the applied field higher than 2.0 T.

Original language	English
Article number	7782353
Journal	IEEE Transactions on Applied Superconductivity
Volume	27
Issue number	4
DOIs	https://doi.org/10.1109/TASC.2016.2639298
Publication status	Published - 2017 Jun 1
Externally published	Yes

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

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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.",

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

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AU - Oka, Tetsuo

AU - Scheiter, Juliane

AU - Hasler, Wolfgang

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AU - Yuanding, Zhao

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