Enhancement of maximum energy product in exchange-coupled BaFe12O19/Fe3O4 core-shell-like nanocomposites

被引：28
作者：
Mohseni, Farzin [1 ,2 ]
Pullar, Robert C. [1 ]
Vieira, Joaquim M. [1 ]
Amaral, Joao S. [2 ]
机构：
[1] Univ Aveiro, Aveiro Inst Mat, CICECO, Dept Mat & Ceram Engn, P-3810193 Aveiro, Portugal
[2] Univ Aveiro, Aveiro Inst Mat, CICECO, Dept Phys, P-3810193 Aveiro, Portugal
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 806卷
关键词：
BaFe12O19; Hexagonal ferrite; Magnetite Fe3O4; Magnetic exchange coupling; Nanocomposite hard magnets; Exchange-spring magnets; BARIUM HEXAFERRITE; MAGNETIC-PROPERTIES; REMANENCE; ALLOYS; SOFT;
D O I：
10.1016/j.jallcom.2019.07.162
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：
Recent economic and environmental concerns have prompted intensive research on the development and optimisation of rare-earth free permanent magnets, in particular of ferrites. M-type barium hexaferrites (BaFe12O19, BaM) are a type of technologically important, low-cost permanent magnet, with high Tc and high resistance to oxidation and corrosion. Their magnetic performance can be improved upon by exploring exchange-coupling mechanisms, to increase their competitiveness with existing rare-earth magnets. The present investigation explores core-shell-like BaM/Fe3O4 nanocomposites, where BaM flake-like particles where prepared via the sol-gel auto-combustion method, and then coated by magnetite spinel nanoparticles via a hydrothermal method, requiring no post-heat treatment. We show how optimised hard to soft magnetic phase ratio and preparation conditions lead to a significant enhancement to the saturation magnetization and remanence, and consequently to an increase of over 75% in the maximum energy product, compared to the parent BaM hexagonal ferrite compound. (C) 2019 Elsevier B.V. All rights reserved.
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页码：120 / 126
页数：7
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