Microstructure and hard magnetic properties of directly synthesized L1 0(Fe 1-xPt x) 78Zr 4B 18 nanocrystalline alloys by melt spinning

T. Bitoh, A. Makino, M. Nakagawa

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The microstructure and the hard magnetic properties of the melt-spun (Fe1-x Ptx) 78 Zr4 B18 (x=0.385, 0.45, 0.50, and 0.55) nanocrystalline alloys have been investigated. The ordered L 10 - FePt phase with a grain size smaller than the critical single domain size is directly formed by rapidly quenching of the alloy melt with x=0.45 and 0.50. The alloys have a mixed microstructure composed of the L 10 -FePt and fcc phases, and exhibit high coercivity (Hc) of 649 and 688 kAm, respectively, in an as-quenched state. On the other hand, the alloys with x=0.385 and 0.55 are found to composed of two fcc phases and fcc+L 12 - FePt3 +L 10 -FePt, respectively, and exhibit Hc values lower than 70 kAm in an as-quenched state. The rapidly quenching of the melt of the (Fe1-x Ptx) 78 Zr4 B18 alloys with x=0.45-0.50 is useful to realize the good hard magnetic properties through the grain size refinement of the near equiatomic FePt alloys.

Original languageEnglish
Article number10H307
JournalJournal of Applied Physics
Issue number10
Publication statusPublished - 2005 May 15
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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