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

Document Type

Article

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.