Abnormal temperature dependence of intrinsic coercivity in sintered Sm-Co-based permanent magnets

被引：56

作者：

Liu, S ^{[1
]}

Yang, J ^{[1
]}

Doyle, G ^{[1
]}

Potts, G ^{[1
]}

Kuhl, GE ^{[1
]}

机构：

[1] Univ Dayton, Magnet Lab, Dayton, OH 45469 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2000年 / 87卷 / 09期

关键词：

D O I：

10.1063/1.372822

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In search of high-temperature permanent magnet materials, sintered Sm-Co-based magnets with abnormal temperature dependence of intrinsic coercivity have been obtained. These magnets have small negative, or near-zero, or large positive temperature coefficients of intrinsic coercivity. A model of coercivity mechanism has been proposed to explain this abnormal temperature dependence. According to this model, the coercivity in 2:17-type permanent magnets is controlled by two conflicting mechanisms. The first mechanism is thermal activation, which leads to decreased coercivity with increasing temperature. The second mechanism can be explained by a pinning process in which increasing temperature may result in an increased difference of crystalline anisotropy between the 2:17 cell phase and 1:5 cell boundary phase and, in turn, a higher coercivity at high temperature. (C) 2000 American Institute of Physics. [S0021-8979(00)77308-7].

引用

页码：6728 / 6730

页数：3

共 7 条

[1] Sm2(Co,Fe,Cu,Zr)17 magnets for use at temperature ≥400 °C [J].