Bonded ferrite-based exchange-coupled nanocomposite magnet produced by Warm compaction
authors Mohseni, F; Pullar, RC; Vieira, JM; Amaral, JS
nationality International
journal JOURNAL OF PHYSICS D-APPLIED PHYSICS
author keywords hexagonal ferrite; magnetite Fe3O4; magnetic exchange coupling; nanocomposite hard magnets; exchange-spring magnets; bonded magnets
keywords STRONTIUM FERRITE; PERMANENT-MAGNET; SOFT
abstract Many modern technologies require permanent magnets with combinations of properties that cannot be met by conventional metallic or ceramic magnets. Ferrite/polymer composite magnets are a type of rare-earth free magnet with a wide range of magnetic and material property combinations. The uncertainty surrounding the supply and pricing of rare-earth elements, along with environmental issues of using these elements, have motivated many researchers to develop high-performance ferrite-based magnets via an exchange spring method. The present study explores magnetite coated M-type ferrite nanocomposites synthesised via a hydrothermal and coprecipitation method, and investigates the mechanical and magnetic properties of warm compressed high-performance exchange-coupled nanocomposites in an epoxy matrix. We show how the powder-to-resin ratio and preparation conditions lead to optimised mechanical properties, and enhancement in the maximum energy product of the composite magnet by up to 120% compared to a commercial SrM bonded plasto-ferrite magnet. These high performance composite magnets can lower the final cost of ferrite based bonded magnets without reducing the permanent magnetic properties or can be used in applications that a ferrite magnet has inadequate performances.
publisher IOP PUBLISHING LTD
issn 0022-3727
isbn 1361-6463
year published 2020
volume 53
issue 49
digital object identifier (doi) 10.1088/1361-6463/abb0bd
web of science category Physics, Applied
subject category Physics
unique article identifier WOS:000573477700001
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5 year journal impact factor 2.902
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