Abstract
The effects of additional C, P or Si on the structure and magnetic properties of melt-spun Fe55Pt25B20 alloy have been investigated. The mixed structure consisting of amorphous and fcc-FePt phases was formed for the Fe55Pt25B18M2 (M=B, C or Si) alloys. Addition of 2at.% of P increased the amorphous-forming ability of the Fe-Pt-B alloy, leading to the formation of an amorphous phase in the M=P alloy. A homogeneous nanocomposite structure consisting of hard L10-FePt and soft Fe2B magnetic phases with average grain sizes of ∼ 40 nm was formed in all the melt-spun alloys annealed at 825 K for 900 s. The good hard magnetic properties with high coercivity of over 540 kA /m were obtained for the M = C or P nanocomposite alloys.
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