Shielding Effect on Flux Trapping in Pulsed-Field Magnetizing for Mg-B Bulk Magnet

T. Oka, K. Yamanaka, K. Sudo, L. Dadiel, J. Ogawa, K. Yokoyama, W. H ßler, J. Noudem, K. Berger, N. Sakai, M. Miryala, M. Murakami

Research output: Contribution to journalConference articlepeer-review

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.

Original languageEnglish
Article number012019
JournalJournal of Physics: Conference Series
Volume1975
Issue number1
DOIs
Publication statusPublished - 2021 Jul 30
Externally publishedYes
Event33rd International Symposium on Superconductivity, ISS 2020 - Tsukuba, Japan
Duration: 2020 Dec 12020 Dec 3

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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