Relation between structure and magnetic properties of Nd2(Fe, Co, Mo)14B/α-Fe nanocomposite magnets

B. Z. Cui, X. K. Sun, L. Y. Xiong, S. T. Cao, Xixiang Zhang, W. Liu, D. Y. Geng, Z. D. Zhang

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


The relationship between nanostructure, exchange coupling and magnetic properties of Nd2(Fe, Co, Mo)14B/α-Fe nanocomposite magnets prepared by mechanical alloying (MA) has been studied systematically. Different categories of grain interfaces have been directly observed, which correspond to different types of exchange couplings in the Nd2Fe14B/α-Fe-type nanocomposite magnets. The notable decrease of the spin-reorientation temperature Tsr of Nd2Fe14B phase convincingly demonstrates the presence of strong inter-grain exchange coupling in the Nd2Fe14B/α-Fe-type nanocomposites. For as-annealed Nd8.4Fe87.1-xMoxB4.5 (x = 0, 0.6, 1.1 and 1.6) and Nd8.4Fe80.4Co5.6Mo1.1B4.5 alloys, the intrinsic coercivity μ0Hc and the maximum magnetic energy product (BH)max are remarkably improved in the alloys with only Mo-additions as well as in the Nd8.4Fe80.4Co5.6Mo1.1B4.5 alloy. The improvement of the magnetic properties is the result of an enhancement of the exchange coupling, because of the modifications of nanostructural factors and phase components by a proper substitution of 3d elements for Fe.

Original languageEnglish (US)
Pages (from-to)242-251
Number of pages10
JournalJournal of Alloys and Compounds
Issue number1-2
StatePublished - Jun 26 2002


  • Mechanical alloying TEM
  • Mössbauer spectroscopy
  • Nanostructured materials
  • Permanent magnets

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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