期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 806, 期 -, 页码 120-126出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.07.162
关键词
BaFe12O19; Hexagonal ferrite; Magnetite Fe3O4; Magnetic exchange coupling; Nanocomposite hard magnets; Exchange-spring magnets
资金
- national funds through the FCT/MEC [POCI-01-0145-FEDER-007679, UID/CTM/50011/2013]
- FCT [IF/00681/2015, IF/01089/2015]
- FEDER
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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