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Title: Influence of quenching rate on the microstructure and magnetic properties of melt-spun L1{sub 0}-FePt/Fe{sub 2}B nanocomposite magnets

Abstract

The quenching rate, which is dependent on the surface velocity (V{sub s}) of Cu wheel during melt spinning, has significant influence on the formation of nanocomposite structure in the Fe{sub 52}Pt{sub 32}B{sub 18} melt-spun ribbons. The L1{sub 0}-FePt/Fe{sub 2}B hard magnetic nanocomposite structure was formed at V{sub s}=20-37 m/s, while the soft magnetic fcc-FePt+amorphous phases were formed at V{sub s}=40-50 m/s. The ribbons melt spun at V{sub s}=37 m/s exhibit in-plane coercivity ({sub i}H{sub c})=760 kA/m, remanence (B{sub r})=0.71 T, and energy product (BH){sub max}=93.4 kJ/m{sup 3}. The B{sub r}=0.74-0.77 T, {sub i}H{sub c}=681-718 kA/m, and (BH){sub max}=101-108 kJ/m{sup 3} were obtained for the ribbons melt spun at V{sub s}=50 m/s and annealed at 748-773 K for 900 s. The improvement in hard magnetic properties is due to the formation of more finer and homogeneous nanocomposite structure, which results in the enhancement in exchange coupling among the nanosized hard L1{sub 0}-FePt and soft Fe{sub 2}B magnetic phases.

Authors:
; ; ; ;  [1]
  1. Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan)
Publication Date:
OSTI Identifier:
20982868
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 101; Journal Issue: 9; Conference: 10. joint MMM/INTERMAG conference, Baltimore, MD (United States), 7-11 Jan 2007; Other Information: DOI: 10.1063/1.2711714; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AMORPHOUS STATE; ANNEALING; BINARY ALLOY SYSTEMS; BORON ALLOYS; COERCIVE FORCE; COMPOSITE MATERIALS; EXCHANGE INTERACTIONS; FCC LATTICES; FERROMAGNETIC MATERIALS; IRON ALLOYS; IRON BORIDES; MAGNETIC PROPERTIES; MICROSTRUCTURE; NANOSTRUCTURES; PERMANENT MAGNETS; PLATINUM ALLOYS; QUENCHING; TERNARY ALLOY SYSTEMS

Citation Formats

Zhang, Wei, Yubuta, Kunio, Sharma, Parmanand, Makino, Akihiro, Inoue, Akihisa, Japan Science and Technology Agency, Sendai 980-8577, and Institute for Materials Research, Tohoku University, Sendai 980-8577. Influence of quenching rate on the microstructure and magnetic properties of melt-spun L1{sub 0}-FePt/Fe{sub 2}B nanocomposite magnets. United States: N. p., 2007. Web. doi:10.1063/1.2711714.
Zhang, Wei, Yubuta, Kunio, Sharma, Parmanand, Makino, Akihiro, Inoue, Akihisa, Japan Science and Technology Agency, Sendai 980-8577, & Institute for Materials Research, Tohoku University, Sendai 980-8577. Influence of quenching rate on the microstructure and magnetic properties of melt-spun L1{sub 0}-FePt/Fe{sub 2}B nanocomposite magnets. United States. doi:10.1063/1.2711714.
Zhang, Wei, Yubuta, Kunio, Sharma, Parmanand, Makino, Akihiro, Inoue, Akihisa, Japan Science and Technology Agency, Sendai 980-8577, and Institute for Materials Research, Tohoku University, Sendai 980-8577. Tue . "Influence of quenching rate on the microstructure and magnetic properties of melt-spun L1{sub 0}-FePt/Fe{sub 2}B nanocomposite magnets". United States. doi:10.1063/1.2711714.
@article{osti_20982868,
title = {Influence of quenching rate on the microstructure and magnetic properties of melt-spun L1{sub 0}-FePt/Fe{sub 2}B nanocomposite magnets},
author = {Zhang, Wei and Yubuta, Kunio and Sharma, Parmanand and Makino, Akihiro and Inoue, Akihisa and Japan Science and Technology Agency, Sendai 980-8577 and Institute for Materials Research, Tohoku University, Sendai 980-8577},
abstractNote = {The quenching rate, which is dependent on the surface velocity (V{sub s}) of Cu wheel during melt spinning, has significant influence on the formation of nanocomposite structure in the Fe{sub 52}Pt{sub 32}B{sub 18} melt-spun ribbons. The L1{sub 0}-FePt/Fe{sub 2}B hard magnetic nanocomposite structure was formed at V{sub s}=20-37 m/s, while the soft magnetic fcc-FePt+amorphous phases were formed at V{sub s}=40-50 m/s. The ribbons melt spun at V{sub s}=37 m/s exhibit in-plane coercivity ({sub i}H{sub c})=760 kA/m, remanence (B{sub r})=0.71 T, and energy product (BH){sub max}=93.4 kJ/m{sup 3}. The B{sub r}=0.74-0.77 T, {sub i}H{sub c}=681-718 kA/m, and (BH){sub max}=101-108 kJ/m{sup 3} were obtained for the ribbons melt spun at V{sub s}=50 m/s and annealed at 748-773 K for 900 s. The improvement in hard magnetic properties is due to the formation of more finer and homogeneous nanocomposite structure, which results in the enhancement in exchange coupling among the nanosized hard L1{sub 0}-FePt and soft Fe{sub 2}B magnetic phases.},
doi = {10.1063/1.2711714},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 101,
place = {United States},
year = {2007},
month = {5}
}