Pulsed-field magnetization of a superconducting bulk magnet after field cooling using a permanent magnet

K. Yokoyama, Tetsuo Oka, K. Noto

Research output: Contribution to journalArticle

Abstract

This paper proposes an effective magnetizing method in which bulk material is magnetized by field cooling (FC) using a permanent magnet before pulsed-field magnetization (PFM) to improve the efficiency of magnetization. The concept of this method is to form the channel composed of the magnetic field and efficiently penetrate the magnetic flux by PFM of the bulk without heat generation. An Nd-Fe-B magnet was arranged at the growth sector boundary (GSB) or the growth sector region (GSR) on the magnetic pole, and the bulk was cooled to 30 K. After the pre-FC, a single pulsed field was applied, varying in amplitude to 3.9, 4.6, and 5.4 T. Magnetic flux density on the bulk surface was measured during the magnetization, and the trapped field distribution was scanned after PFM. The experimental results showed a decrease in the trapped field for pre-FC at GSR. It was considered that the existing flux by pre-FC blocked the flux penetration of PFM. Afterward, pre-FC using a C-shaped magnet was devised, and the validity was confirmed.

Original languageEnglish
Article number6094195
JournalIEEE Transactions on Applied Superconductivity
Volume22
Issue number3
DOIs
Publication statusPublished - 2012 Jun 25
Externally publishedYes

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permanent magnets
Permanent magnets
Magnets
Magnetization
magnets
Cooling
cooling
magnetization
sectors
Magnetic flux
magnetic flux
Fluxes
magnetic poles
heat generation
Heat generation
Poles
penetration
flux density
Magnetic fields
magnetic fields

Keywords

  • Field cooling
  • flux flow
  • permanent magnet
  • pulsed-field magnetization
  • superconducting bulk magnet

ASJC Scopus subject areas

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

Cite this

Pulsed-field magnetization of a superconducting bulk magnet after field cooling using a permanent magnet. / Yokoyama, K.; Oka, Tetsuo; Noto, K.

In: IEEE Transactions on Applied Superconductivity, Vol. 22, No. 3, 6094195, 25.06.2012.

Research output: Contribution to journalArticle

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