Transmission electron microscopy study on the grain boundaries and magnetic domains in Nd-Fe-B based magnets

Kohei Sato, Yasukazu Murakami, Daisuke Shindo, Satoshi Hirosawa, Akira Yasuhara

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The effect of post-sintering heat treatment on the coercivity of Nd-Fe-B based permanent magnets was studied by observing their crystallographic and magnetic microstructures. High-resolution transmission electron microscopy revealed meandering grain boundaries in die as-sintered state, and the smoothness of the boundaries was improved by the post-sintering heat treatment. Electron holography demonstrated that magnetization reversal occurred in a stepwise manner in individual grains in the specimen subjected to the post-sintering heat treatment, whereas reversal was occurred simultaneously in different grains in the as-sintered specimen.

Original languageEnglish
Pages (from-to)333-340
Number of pages8
JournalMaterials Transactions
Volume51
Issue number2
DOIs
Publication statusPublished - 2010 Feb 1

Keywords

  • Coercivity
  • Domain wall
  • Electron holography
  • Lorentz microscopy
  • Permanent magnet

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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