Transmission Electron Microscopy Study on the Grain Boundaries and Magnetic Domains in Nd-Fe-B Based Magnets

被引：1

作者：

Sato, Kohei ^{[1
]}

Murakami, Yasukazu ^{[1
]}

Shindo, Daisuke ^{[1
]}

Hirosawa, Satoshi ^{[2
]}

Yasuhara, Akira ^{[3
]}

机构：

[1] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan

[2] Hitachi Met Ltd, Osaka 6180013, Japan

[3] JEOL Ltd, Tokyo 1968558, Japan

来源：

MATERIALS TRANSACTIONS | 2010年 / 51卷 / 02期

基金：

日本学术振兴会;

关键词：

electron holography; Lorentz microscopy; permanent magnet; coercivity; domain wall; PERMANENT-MAGNETS; COERCIVITY; MICROSTRUCTURE;

D O I：

10.2320/matertrans.M2009277

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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. [doi:10.2320/matertrans.M2009277]

引用

页码：333 / 340

页数：8

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