Research Papers in Physics and Astronomy


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Published in Journal of Physics D: Applied Physics, 36:17 (7 September 2003), pp. L67–L70. Copyright © 2003 Institute of Physics/IOP Publishing. Used by permission.


The structural and magnetic properties of rare-earth nanocomposite magnets of a (Nd,Dy)(Fe,Co,Nb,B) 5.5 single layer and a (Nd,Dy)(Fe,Co,Nb,B) 5.5/α-Fe multilayer prepared by sputtering and heat treatment have been investigated. Incomplete exchange coupling behaviour is observed in the Ti-buffered NdDyFeCoNbB + 40 wt%Fe single layer magnet. After annealing, the laminated nanostructure consisting of mutually dispersed soft and hard phases results in remanence enhancement. The optimum magnetic properties of Jr= 1.11 T, μ0i Hc = 0.88 T and (BH)max = 192 kJ m-3 are achieved in the multilayer magnet annealed at 550°C for 30 min. The designed multilayer film with thinner soft magnetic layers may favor the formation of more ideal nanostructures for exchange coupling between soft- and hard-magnetic phases.

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