Grain boundary modification induced magnetization reversal process and giant coercivity enhancement in 2:17 type SmCo magnets
Grain boundary modification induced magnetization reversal process and giant coercivity enhancement in 2:17 type SmCo magnets
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DOI：
10.1016/j.jallcom.2019.01.217
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发表时间：
2019-05-15
影响因子：
6.2
通讯作者：
Yan, Aru
中科院分区：
文献类型：
--
作者：
Yan, Guanghui;Liu, Zhuang;Yan, Aru
通过掺杂 0.4 wt% CuO，晶界改性导致 Sm25Co48Fe20Cu5Zr2 磁体的巨矫顽力从 945 kA/m 增强到 1904 kA/m。在未掺杂和掺杂磁体之间清楚地观察到不同的磁化反转行为。与未掺杂磁体相比，掺杂磁体中明显发现Cu沿晶界富集，促进了规则的细胞结构。原位克尔观测表明，完整的细胞结构可以增强晶界区域的钉扎场，并且改变的晶界抑制了磁化反转向晶粒内部的传播，从而导致了显着的矫顽力增量。 (C) 2019 Elsevier B.V. 保留所有权利。
Grain boundary modification induced giant coercivity enhancement from 945 kA/m to 1904 kA/m was achieved in Sm25Co48Fe20Cu5Zr2 magnets by doping 0.4 wt% CuO. Different magnetization reversal behaviors were clearly observed between un-doped and doped magnets. Compared with un-doped magnets, Cu enrichment along grain boundary promoting regular cellular structure was obviously found in doped magnet. The in-situ Kerr observation indicated that complete cellular structure could strengthen the pinning field of grain boundary regions and the propagations of magnetization reversals into interiors of grains were restrained by the modified grain boundaries, which resulted in the remarkable coercivity increment. (C) 2019 Elsevier B.V. All rights reserved.