Synthesis of Fe-Pt-B nanocomposite magnets with high coercivity by rapid solidification

Wei Zhang; Kunio Yubuta; Parmanand Sharma; Akihisa Inoue

doi:10.1063/1.2172547

Synthesis of Fe-Pt-B nanocomposite magnets with high coercivity by rapid solidification

Wei Zhang, Kunio Yubuta, Parmanand Sharma, Akihisa Inoue

Materials Development Division

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

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.

Original language	English
Article number	08E914
Journal	Journal of Applied Physics
Volume	99
Issue number	8
DOIs	https://doi.org/10.1063/1.2172547
Publication status	Published - 2006 May 25

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Synthesis of Fe-Pt-B nanocomposite magnets with high coercivity by rapid solidification",

abstract = "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.",

author = "Wei Zhang and Kunio Yubuta and Parmanand Sharma and Akihisa Inoue",

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AU - Zhang, Wei

AU - Yubuta, Kunio

AU - Sharma, Parmanand

AU - Inoue, Akihisa

PY - 2006/5/25

Y1 - 2006/5/25

N2 - 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.

AB - 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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