Enhanced coercivity in thermally processed (Nd,Dy) (Fe,Co,Nb,B)5.5 α-Fe nanoscale multilayer magnets

W. Liu, X. Z. Li, J. P. Liu, X. K. Sun, C. L. Chen, R. Skomski, Z. D. Zhang, D. J. Sellmyer

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Structural and magnetic properties of laminated (Nd,Dy) (Fe,Co,Nb,B)5.5 Fe nanocomposites are investigated. Normally, the addition of the soft phase to the hard phase enhances the remanence but deteriorates the permanent-magnet performance of the material by reducing the coercivity. In the present system, the coercivity increases to 1608 kAm (20.2 kOe) in thermally processed Nd-Dy-Fe-Co-Nb-B (15 nm) Fe (4 nm) multilayered nanocomposites, which is higher than that of the single-layer hard-magnetic film. The abnormally high coercivity is achieved by annealing at relatively high temperature, which breaks the laminated structure of the as-deposited multilayer. A likely physical explanation of the enhanced coercivity is the introduction of the domain-wall pinning sites that counteract the inevitable decrease of the nucleation field.

Original languageEnglish (US)
Article number104308
JournalJournal of Applied Physics
Volume97
Issue number10
DOIs
StatePublished - May 15 2005

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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