Microchemistry and magnetization reversal mechanism in melt-spun 2:17-type Sm-Co magnets

被引：62

作者：

Yan, A ^{[1
]}

Gutfleisch, O ^{[1
]}

Gemming, T ^{[1
]}

Müller, KH ^{[1
]}

机构：

[1] Leibniz Inst Solid State & Mat Res Dresden, D-01171 Dresden, Germany

来源：

APPLIED PHYSICS LETTERS | 2003年 / 83卷 / 11期

关键词：

D O I：

10.1063/1.1611641

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The stability of microstructure and of microchemistry in melt-spun precipitation-hardened Sm(Co,Fe,Cu,Zr)(z) magnets at high temperature and its effect on the magnetic properties, especially the coercivity at room temperature, were investigated by transmission electron microscopy, nanoprobe chemical analysis, and magnetic measurements. A very large gradient of the Cu content within the 1:5-type cell boundary phase was observed in highly coercive melt-spun Sm(Co,Fe,Cu,Zr)(z) magnets with uniform cellular structure. After an additional isothermal aging at 850 degreesC for 5 min, the coercivity is reduced dramatically from 3 T to 0.16 T. This is accompanied by the disappearance of the large gradient of Cu content within the cell boundary phase. Thus, it is proposed that the high coercivity in 2:17 Sm-Co magnets originates from the large gradient of domain wall energy within the Sm(Co,Cu)(5) cell boundary phase. This gradient is caused by a very rapid phase separation taking place within the cell boundary phase during slow cooling. (C) 2003 American Institute of Physics.

引用

页码：2208 / 2210

页数：3

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