Nanocomposite (Nd,Dy)(Fe,Co,Nb,B)5.5/α-Fe multilayer magnets with high performance.

Authors :: Liu, W.
Zhang, Z. D.
Liu, J. P.
Dai, Z. R.
Wang, Z. L.
Sun, X. K.
Sellmyer, D. J.
Source :: Journal of Physics D: Applied Physics; Sep2003, Vol. 36 Issue 17, pL63, 4p
Publication Year :: 2003
Abstract: The structural and magnetic properties of rare-earth nanocomposite magnets of a (Nd,Dy)(Fe,Co,Nb,B)<subscript>5.5</subscript> single layer and a (Nd,Dy)(Fe,Co,Nb,B)<subscript>5.5</subscript>/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 J<subscript>r</subscript>=1.11 T, μ<subscript>0i</subscript>H<subscript>c</subscript>=0.88 T and (BH)<subscript>max</subscript>=192 kJ m<superscript>-3</superscript> are achieved in the multilayer magnet annealed at 550°C for 30 min. The designed multilayer film with thinner soft magnetic layers may favour the formation of more ideal nanostructures for exchange coupling between soft- and hard-magnetic phases. [ABSTRACT FROM AUTHOR]

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