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
|