Magnetizing of permanent magnets using HTS bulk magnets

Tetsuo Oka, Tomoki Muraya, Nobutaka Kawasaki, Satoshi Fukui, Jun Ogawa, Takao Sato, Toshihisa Terasawa

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A demagnetized Nd-Fe-B permanent magnet was scanned just above the magnetic pole which contains the HTS bulk magnet generating a magnetic field of 3.27 T. The magnet sample was subsequently found to be fully magnetized in the open space of the static magnetic fields. We examined the magnetic field distributions when the magnetic poles were scanned twice to activate the magnet plate inversely with various overlap distances between the tracks of the bulk magnet. The magnetic field of the "rewritten" magnet reached the values of the magnetically saturated region of the material, showing steep gradients at the border of each magnetic pole. As a replacement for conventional pulse field magnetizing methods, this technique is proposed to expand the degree of freedom in the design of electromagnetic devices, and is proposed as a novel practical method for magnetizing rare-earth magnets, which have excellent magnetic performance and require intense fields of more than 3 T to be activated.

Original languageEnglish
Pages (from-to)27-31
Number of pages5
JournalCryogenics
Volume52
Issue number1
DOIs
Publication statusPublished - 2012 Jan 1
Externally publishedYes

Keywords

  • Magnetic field
  • Magnetization
  • Permanent magnet
  • Refrigerator
  • Superconductor
  • Trapped field

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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  • Cite this

    Oka, T., Muraya, T., Kawasaki, N., Fukui, S., Ogawa, J., Sato, T., & Terasawa, T. (2012). Magnetizing of permanent magnets using HTS bulk magnets. Cryogenics, 52(1), 27-31. https://doi.org/10.1016/j.cryogenics.2011.10.005