TY - JOUR
T1 - Pulse-Field Magnetization for Disc-Shaped MgB2 Bulk Magnets
AU - Miyazaki, Taisuke
AU - Fukui, Satoshi
AU - Ogawa, Jun
AU - Sato, Takao
AU - Oka, Tetsuo
AU - Scheiter, Juliane
AU - Hasler, Wolfgang
AU - Kulawansha, Eranda
AU - Yuanding, Zhao
AU - Yokoyama, Kazuya
N1 - Funding Information:
This work was supported by the U.S. Department of Energy under Grant ABC-123456.
PY - 2017/6
Y1 - 2017/6
N2 - 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.
AB - 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.
KW - Bulk magnet
KW - MgB
KW - flux jump
KW - pulsed-field magnetization
KW - trapped field
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U2 - 10.1109/TASC.2016.2639298
DO - 10.1109/TASC.2016.2639298
M3 - Article
AN - SCOPUS:85012972636
VL - 27
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
IS - 4
M1 - 7782353
ER -