Investigation of structure and magnetization reversal in mechanically alloyed SmCo6.8Zr0.2 magnets

被引：21
|
作者：
Liu, Z. [1 ]
Chen, R. J. [1 ]
Lee, D. [1 ]
Yan, A. R. [1 ]
机构：
[1] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Zhejiang Prov Key Lab Magnet Mat & Applicat Techn, Key Lab Magnet Mat & Devices, Ningbo 315201, Zhejiang, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2011年 / 509卷 / 09期
关键词：
SmCo; Nanocrystalline magnetic materials; Inter-grain exchange coupling; Magnetization reversal; Irreversible nucleation field; CU; NANOCRYSTALLINE; COERCIVITY; FE; TI;
D O I：
10.1016/j.jallcom.2010.12.192
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Nanocrystalline SmCo6.8Zr0.2 permanent magnets are prepared by intensive milling and subsequent annealing. XRD patterns of the samples annealed at 600 degrees C and 700 degrees C show a single SmCo7 phase with TbCu7 structure, while the SmCo7 phase decomposes into a mixture of Sm2Co17 and Co23Zr6 phase at higher annealing temperatures. The highest coercivity and energy product of about 2.06 T and 9.5MGOe are obtained in the sample annealed at 700 degrees C for 10 min. Further analysis reveals that a very strong inter-grain exchange coupling is observed in samples annealed at 700 degrees C for 3 (SZ-3) and 10 (SZ-10) min, indicating by the high remanence ratio and positive delta m in henkel-plot. It was supposed that the magnetization reversal process is controlled by domain wall pinning. (C) 2011 Elsevier B. V. All rights reserved.
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页码：3967 / 3971
页数：5
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