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

doi:10.2320/matertrans.M2009277

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 journal › Article › peer-review

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 language	English
Pages (from-to)	333-340
Number of pages	8
Journal	Materials Transactions
Volume	51
Issue number	2
DOIs	https://doi.org/10.2320/matertrans.M2009277
Publication status	Published - 2010 Feb
Externally published	Yes

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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10.2320/matertrans.M2009277

Cite this

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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 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.",

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author = "Kohei Sato and Yasukazu Murakami and Daisuke Shindo and Satoshi Hirosawa and Akira Yasuhara",

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T1 - Transmission electron microscopy study on the grain boundaries and magnetic domains in Nd-Fe-B based magnets

AU - Sato, Kohei

AU - Murakami, Yasukazu

AU - Shindo, Daisuke

AU - Hirosawa, Satoshi

AU - Yasuhara, Akira

PY - 2010/2

Y1 - 2010/2

N2 - 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.

AB - 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.

KW - Coercivity

KW - Domain wall

KW - Electron holography

KW - Lorentz microscopy

KW - Permanent magnet

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

Abstract

Keywords

ASJC Scopus subject areas

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