Effects of magnetic field heat treatment on Sm-Co/α-Fe nanocomposite permanent magnetic materials prepared by high energy ball milling

被引：30
作者：
Su, Yanfeng [1 ,2 ]
Su, Hao [2 ]
Zhu, Yuejin [1 ]
Wang, Fang [3 ]
Du, Juan [2 ]
Xia, Weixing [2 ]
Yan, Aru [2 ]
Liu, J. Ping [2 ]
Zhang, Jian [2 ]
机构：
[1] Ningbo Univ, Fac Sci, Ningbo 315211, Zhejiang, Peoples R China
[2] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Key Lab Magnet Mat & Devices, Ningbo 315201, Zhejiang, Peoples R China
[3] NingBo Univ Technol, Sch Mat Sci & Engn, Ningbo, Zhe Jiang Provi, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 647卷
关键词：
Permanent magnets; Nanofabrications; High energy ball milling; Magnetic field heat treatment; Magnetic measurements; FILMS; PRODUCT; ENHANCEMENT; IMPROVEMENT;
D O I：
10.1016/j.jallcom.2015.06.152
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：
Effects of magnetic field heat treatment on the structure and magnetic properties of Sm-Co/alpha-Fe nanocomposite permanent magnetic materials fabricated by high energy ball milling are investigated in the present work. After a magnetic field heat treatment below 700 degrees C on as-milled amorphous Sm-Co/alpha-Fe samples, the nanocomposite magnets with strong hard and soft magnetic interaction, showing a hysteresis loop of single phase characteristic, are obtained. The coercivity increases with the increase of annealing temperature. The coercivity, remanence and remanence ratio of the Sm-Co/Fe nanocomposite magnets are all enhanced after a heat treatment at a magnetic field as compared with those of nanocomposite magnets heat treated without a magnetic field. X ray diffraction analysis shows that the diffusion between the Sm-Co hard and alpha-Fe soft phases is suppressed by the magnetic field applied during the heat treatment process, leading to the inhibition of the grain growth of nanocrystal Sm-Co and alpha-Fe phases, and a finer nanostructure is obtained. Thus, a higher coercivity, remanence and remanence ratio are realized in Sm-Co/alpha-Fe nanocomposite magnets after the magnetic field heat treatment. Magnetic field heat treatment also makes the direction of c axis of Sm-Co hard grains along the heat treatment magnetic field direction, leading to an enhancement of magnetic anisotropy of the Sm -Co/Fe nanocomposite magnets. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：375 / 379
页数：5
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