Journal
ADVANCED ELECTRONIC MATERIALS
Volume 2, Issue 4, Pages -Publisher
WILEY
DOI: 10.1002/aelm.201500365
Keywords
composites; exchange coupling; permanent magnets
Funding
- European Commission through project NANOPYME [310516, FP7-NMP-2012-SMALL-6 NANOPYME]
- Spanish Ministerio de Economia y Competitividad [MAT2013-48009-C4-1-P]
- European Social Found
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Interfacial exchange coupling is known to improve the permanent magnetic performance (i.e., maximal energy product) in composites of magnetically hard and soft particles. The prevailing strategy, employed in a plethora of compositions, consists in maximizing the coupling between the hard and soft phases and optimizing material parameters such as particle size or phase composition. In CoFe2O4-FeCo nanocomposites, it is experimentally shown that interparticle uncoupling in combination with the sizes of the soft phase grains below the single-domain threshold leads to enhanced magnetic properties at room temperature, while maximizing exchange coupling implies a collapse in coercivity and hence in the maximal energy product. The results are corroborated by micromagnetic calculations and the origin of the exchange-induced softening is discussed. It is emphasized that engineering interfaces in order to optimize, rather than maximize, the degree of exchange coupling are a necessary requirement to improve the energy product in nanocomposite magnets and to successfully develop advanced rare-earth-free permanent magnets.
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