Nanocomposite (Nd,Dy)(Fe,Co,Nb,B) _5.5/α-Fe multilayer magnets with high performance

Authors

W. Liu, Shenyang National Laboratory for Materials Science, Institute of Metal Research
Z.D. Zhang, Shenyang National Laboratory for Materials Science, Institute of Metal Research
J. Ping Liu, Institute for Micromanufacturing, Louisiana Tech University, Ruston, LAFollow

Date of this Version

9-7-2003

Comments

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. http://www.iop.org/EJ/journal/JPhysD.

Abstract

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 J_r= 1.11 T, μ_0i H_c = 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.