Structural analysis of nanocrystals and their role in the coercivity mechanism of Nd-Fe-Al-Dy bulk amorphous ferromagnets

被引：7
|
作者：
Tan, X. H. [1 ]
Collocott, S. J. [2 ]
Liu, H. W. [3 ]
Xiong, X. Y. [4 ]
Xu, H. [1 ]
机构：
[1] Shanghai Univ, Lab Microstruct, Shanghai 200444, Peoples R China
[2] CSIRO Mat Sci & Engn, Lindfield, NSW 2070, Australia
[3] Univ Sydney, Australian Ctr Microscopy & Microanal, Sydney, NSW 2006, Australia
[4] Monash Univ, Monash Ctr Electron Microscopy, Clayton, Vic 3800, Australia
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2013年 / 343卷
基金：
中国国家自然科学基金;
关键词：
Bulk amorphous ferromagnet; Nanocrystal; Coercivity mechanism; MAGNETIC-PROPERTIES; MOLD-CAST; CRYSTAL-STRUCTURE; HARD MAGNETS; CO-AL; ALLOYS; MICROSTRUCTURE; ND60FE30AL10; SYSTEM; PHASE;
D O I：
10.1016/j.jmmm.2013.04.055
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The magnetic property and microstructure of Nd60-xFe30Al10Dyx, (x=0, 2, 4) bulk ferromagnets have been investigated. At room temperature, each alloy sample shows hard magnetic behavior, and the intrinsic coercivity increases significantly with increasing Dy content. Transmission electron microscopy (TEM) and Atom probe tomography (APT) results show nanocrystals of width 5-20 nm embedded in the Fe-rich amorphous matrix. The coercivity mechanism of the Nd60-xFe30Al10Dy (x=0, 2, 4) amorphous alloys is discussed in the context of Gaunt's strong pinning model of domain walls. The crystallographic phases of nanocrystals identified by high-resolution TEM can act as pinning centers. Our findings give further insight into the coercivity mechanism of Nd-based bulk amorphous alloys through a better understanding of the nanostructural environment. (C) 2013 Elsevier B.V. All rights reserved.
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页码：27 / 31
页数：5
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