Magnetic structure analysis of Nd-Fe-B based nanocomposite magnets by electron holography

Translated title of the contribution: Magnetic structure analysis of Nd-Fe-B based nanocomposite magnets by electron holography

Daisuke Shindo, H. S. Park, Hirokazu Kanekiyo, Satoshi Hirosawa

Research output: Contribution to journalArticlepeer-review

Abstract

Magnetic flux distribution in Nd-Fe-B based nanocomposite magnets was investigated at nanometer scale by electron holography. Both Nd 4.5Fe 77B 18.5 and Nd-Fe-B-Ti-C, the latter of which was newly developed and commercialized under trade-name of SPRAX, are found to consist of hard and soft magnetic grains of 10-30 nm in diameter. Through the comparison of reconstructed phase images of Nd 4.5Fe 77B 18.5 and Nd-Fe-B-Ti-C, it is found that the lines of magnetic flux of Nd-Fe-B-Ti-C fluctuate more largely than Nd 4.5Fe 77B 18.5 in both demagnetized and remanent states. The fluctuation in the distribution of lines of magnetic flux is considered to result from the randomness in the crystal orientation of the hard magnetic grains with high anisotropy. It is also pointed out that the fluctuated distribution of lines of magnetic flux is consistent with the high coercivity and high maximum energy product of Nd-Fe-B-Ti-C.

Translated title of the contributionMagnetic structure analysis of Nd-Fe-B based nanocomposite magnets by electron holography
Original languageJapanese
Pages (from-to)962-966
Number of pages5
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume69
Issue number11
DOIs
Publication statusPublished - 2005 Nov

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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