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
收藏
页码：333 / 340
页数：8
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