Abstract
The L10FePt∕Fe2B-type nanocomposite magnets with high coercivity have been obtained in the Febal.Pt30–32B18–20 alloys directly by the melt spinning technique. The as-spun ribbons showed good hard magnetic properties. The remanence, coercivity, and energy product for the Fe52Pt30B18 alloy melt spun at a wheel circumferential speed (Vs) of 35m∕s were 0.70 T, 783kA∕m, and 88.0kJ∕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 L10 FePt and Fe2B phases with the average grain sizes of ∼40nm. The good hard magnetic properties are interpreted in terms of exchange magnetic coupling among the nanoscale hard L10 FePt and soft Fe2B 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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