Enhancement of maximum energy product in exchange-coupled BaFe12O19/Fe3O4 core-shell-like nanocomposites
authors Mohseni, F; Pullar, RC; Vieira, JM; Amaral, JS
nationality International
journal JOURNAL OF ALLOYS AND COMPOUNDS
author keywords BaFe12O19; Hexagonal ferrite; Magnetite Fe3O4; Magnetic exchange coupling; Nanocomposite hard magnets; Exchange-spring magnets
keywords BARIUM HEXAFERRITE; MAGNETIC-PROPERTIES; REMANENCE; ALLOYS; SOFT
abstract 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.
publisher ELSEVIER SCIENCE SA
issn 0925-8388
year published 2019
volume 806
beginning page 120
ending page 126
digital object identifier (doi) 10.1016/j.jallcom.2019.07.162
web of science category Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
subject category Chemistry; Materials Science; Metallurgy & Metallurgical Engineering
unique article identifier WOS:000485039800015
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5 year journal impact factor 3.315
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