MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Transmission Electron Microscopy Study on the Grain Boundaries and Magnetic Domains in Nd–Fe–B Based Magnets
Kohei SatoYasukazu MurakamiDaisuke ShindoSatoshi HirosawaAkira Yasuhara
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2010 Volume 51 Issue 2 Pages 333-340

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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 the 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.

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© 2010 The Japan Institute of Metals and Materials
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