The L 10 FePt Fe2 B -type nanocomposite magnets with high coercivity have been obtained in the Febal. Pt30-32 B18-20 alloys directly by the melt spinning technique. The as-spun ribbons showed good hard magnetic properties. The remanence, coercivity, and energy product for the Fe52 Pt30 B18 alloy melt spun at a wheel circumferential speed (Vs) of 35 ms were 0.70 T, 783 kAm, and 88.0 kJ m3, respectively. The spring-back minor M-H loops were also observed for the alloy. The melt-spun alloy has a nanocomposite structure, consisting of L 10 FePt and Fe2 B phases with the average grain sizes of ∼40 nm. The good hard magnetic properties are interpreted in terms of exchange magnetic coupling among the nanoscale hard L 10 FePt and soft Fe2 B magnetic phases. The present easy and single step process of forming the nanocomposite magnet having high coercivity is encouraging for the future development of Fe-Pt-based hard magnetic alloys.
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