Abstract

MgB2 superconducting bulk materials are characterized as simple and uniform metallic compounds, and capable of trapping field of non-distorted conical shapes. Although pulsed-field magnetization technique (PFM) is expected to be a cheap and an easy way to activate them, the heat generation due to the magnetic flux motion causes serious degradation of captured fields. The authors precisely estimated the flux trapping property of the bulk samples, found that the flux-shielding effect closely attributed to the sample dimensions. The magnetic field capturing of Ti-5.0wt% sample reached the highest value of 0.76 T. The applied field which reached the centre of the sample surface shifted from 1.0 T to 1.2 T with increasing sample thickness from 3.67 mm to 5.80 mm. This means that the shielding effect was enhanced with increasing the sample thickness. Moreover, Ti-addition affected the frequency of flux jump happenings. The occurrence of flux jumps was suppressed in 5.0wt%Ti-added sample. This means that the heat capacity of the compounds was promoted by Ti addition.

Details

Title
Shielding Effect on Flux Trapping in Pulsed-Field Magnetizing for Mg-B Bulk Magnet
Author
Oka, T 1 ; Yamanaka, K 1 ; Sudo, K 1 ; Dadiel, L 1 ; Ogawa, J 2 ; Yokoyama, K 3 ; Häßler, W 4 ; Noudem, J 5 ; Berger, K 6 ; Sakai, N 1 ; Miryala, M 1 ; Murakami, M 1 

 Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-Ward, Tokyo 135-8548, Japan 
 Niigata University, 8050 Ikarashi-Ninocho, Nishi-Ward, Niigata 950-8151, Japan 
 Ashikaga University, 268-1 Omae-cho, Ashikaga 326-8558, Japan 
 IFW Dresden, 20 Helmholtzstr., Dresden 01069, Germany 
 Caen University, rue Louis Aragon BP78 50130 Cherbourg-Octeville, France 
 Lorraine University, 54 506 Vandœuvre-lès-Nancy Cedex, France 
Publication year
2021
Publication date
Jul 2021
Publisher
IOP Publishing
ISSN
17426588
e-ISSN
17426596
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2557523769
Copyright
© 2021. This work is published under http://creativecommons.org/licenses/by/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.