Magnetic hardening of melt-spun nanocomposite Nd2Fe14B/Fe magnets

I. Panagiotopoulos, L. Withanawasam, A. S. Murthy, G. C. Hadjipanayis, E. W. Singleton, D. J. Sellmyer

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Coercivity optimization studies were done on melt-spun nanocomposite Nd4R2Fe87-xNbTXB6 (R=Nd,Y,Dy; T=Ag,Cu) isotropic ribbon samples. The maximum attainable coercivities, after adjusting the annealing time, were found to be very sensitive to the annealing temperatures. The optimum magnetic properties [HC=3.9 kOe, (BH)max=10 MGOe] were obtained by annealing at 750-775 °C for a few minutes. Optimization by flash annealing gave similar results. Microstructural studies show that the grain size is greater than the theoretically predicted grain size for optimum coupling between the hard and the soft phase. With the annealing conditions used, Nd4Dy2Fe87NbB6 samples gave moderate coercivities and in Nd4Y2Fe87NbB6 samples the coercivity was reduced more than the expected reduction in the anisotropy field due to the presence of Y.

Original languageEnglish (US)
Pages (from-to)4827-4829
Number of pages3
JournalJournal of Applied Physics
Volume79
Issue number8 PART 2A
DOIs
StatePublished - Apr 15 1996

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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