Oxidation fabrication and enhanced soft magnetic properties for core-shell FeCo/CoFe2O4 micron-nano composites

被引：60
作者：
Yang, Bai [1 ]
Li, Xiaopan [1 ]
Guo, Ruiyuan [1 ]
Yu, Ronghai [1 ]
机构：
[1] Beihang Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Aerosp Adv Mat & Performance, Beijing 100191, Peoples R China
来源：
MATERIALS & DESIGN | 2017年 / 121卷
基金：
北京市自然科学基金;
关键词：
Controlled surface oxidation; FeCo/CoFe2O4; composites; Low core loss; High magnetic induction; CHEMICAL-SYNTHESIS; FE; NANOPARTICLES; NANOCOMPOSITES; NANOCRYSTALS; RESISTIVITY; RESONANCE; POWDER; ROUTE; FILMS;
D O I：
10.1016/j.matdes.2017.02.073
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
FeCo/CoFe2O4 micron-nano composites have been fabricated by controllably oxidizing micron-sized FeCo particles. High-purity 60-nm-thick CoFe2O4 layers can be formed in situ on the surface of the unoxidized FeCo particles to form a dense FeCo/CoFe2O4 core-shell structure. The good intrinsic magnetic properties, including a high saturation magnetization of 210 A. m(2). kg(-1) and a low coercivity of 11.7 Oe, are obtained in these FeCo/CoFe2O4 composites due to the nanoscale thickness of the ferrimagnetic CoFe2O4 layers. For traditional soft magnetic composites, low core loss can only be obtained by seriously sacrificing their magnetic induction. In this work, balanced soft magnetic properties with low core loss and high magnetic induction are obtained in the fully compacted FeCo/CoFe2O4 composites, which promise great potential applications in high-power and high frequency magnetic devices. This controlled surface oxidation may also provide an effective surface treatment for metal-based soft magnets to improve their overall performance. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：272 / 279
页数：8
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