From FePt-Fe3O4 to L10-FePt-Fe nanocomposite magnets with a gradient interface

Weiwei Yang; Wenjuan Lei; Yongsheng Yu; Wenlei Zhu; T. A. George; X. Z. Li; D. J. Sellmyer; Shouheng Sun

doi:10.1039/c5tc01145k

From FePt-Fe₃O₄ to L1₀-FePt-Fe nanocomposite magnets with a gradient interface

Weiwei Yang, Wenjuan Lei, Yongsheng Yu, Wenlei Zhu, T. A. George, X. Z. Li, D. J. Sellmyer, Shouheng Sun

Physics and Astronomy

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39 Scopus citations

Abstract

We report a novel approach for the fabrication of exchange-coupling L1₀-FePt-bcc-Fe nanocomposites with a gradient interface between hard and soft phases from FePt nanoparticles (NPs) and FePt-Fe₃O₄ dumbbell shaped NPs, which are prepared by a facile one-pot synthesis method. High temperature annealing in argon is first used to convert FePt in FePt-Fe₃O₄ dumbbell shaped NPs to the L1₀-FePt phase. Then Fe₃O₄ in FePt-Fe₃O₄ dumbbell shaped NPs is reduced to bcc-Fe by low temperature annealing in reducing gas, forming L1₀-FePt-Fe nanocomposites. The L1₀-FePt-Fe nanocomposites exhibit both large coercivity and high magnetic moment. The work demonstrates that creating a nanoscale gradient interface between magnetically hard and soft phases is a promising approach for the fabrication of high performance permanent magnets.

Original language	English (US)
Pages (from-to)	7075-7080
Number of pages	6
Journal	Journal of Materials Chemistry C
Volume	3
Issue number	27
DOIs	https://doi.org/10.1039/c5tc01145k
State	Published - Jul 21 2015

ASJC Scopus subject areas

General Chemistry
Materials Chemistry

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title = "From FePt-Fe3O4 to L10-FePt-Fe nanocomposite magnets with a gradient interface",

abstract = "We report a novel approach for the fabrication of exchange-coupling L10-FePt-bcc-Fe nanocomposites with a gradient interface between hard and soft phases from FePt nanoparticles (NPs) and FePt-Fe3O4 dumbbell shaped NPs, which are prepared by a facile one-pot synthesis method. High temperature annealing in argon is first used to convert FePt in FePt-Fe3O4 dumbbell shaped NPs to the L10-FePt phase. Then Fe3O4 in FePt-Fe3O4 dumbbell shaped NPs is reduced to bcc-Fe by low temperature annealing in reducing gas, forming L10-FePt-Fe nanocomposites. The L10-FePt-Fe nanocomposites exhibit both large coercivity and high magnetic moment. The work demonstrates that creating a nanoscale gradient interface between magnetically hard and soft phases is a promising approach for the fabrication of high performance permanent magnets.",

author = "Weiwei Yang and Wenjuan Lei and Yongsheng Yu and Wenlei Zhu and George, {T. A.} and Li, {X. Z.} and Sellmyer, {D. J.} and Shouheng Sun",

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AU - Yang, Weiwei

AU - Lei, Wenjuan

AU - Yu, Yongsheng

AU - Zhu, Wenlei

AU - George, T. A.

AU - Li, X. Z.

AU - Sellmyer, D. J.

AU - Sun, Shouheng

PY - 2015/7/21

Y1 - 2015/7/21

N2 - We report a novel approach for the fabrication of exchange-coupling L10-FePt-bcc-Fe nanocomposites with a gradient interface between hard and soft phases from FePt nanoparticles (NPs) and FePt-Fe3O4 dumbbell shaped NPs, which are prepared by a facile one-pot synthesis method. High temperature annealing in argon is first used to convert FePt in FePt-Fe3O4 dumbbell shaped NPs to the L10-FePt phase. Then Fe3O4 in FePt-Fe3O4 dumbbell shaped NPs is reduced to bcc-Fe by low temperature annealing in reducing gas, forming L10-FePt-Fe nanocomposites. The L10-FePt-Fe nanocomposites exhibit both large coercivity and high magnetic moment. The work demonstrates that creating a nanoscale gradient interface between magnetically hard and soft phases is a promising approach for the fabrication of high performance permanent magnets.

AB - We report a novel approach for the fabrication of exchange-coupling L10-FePt-bcc-Fe nanocomposites with a gradient interface between hard and soft phases from FePt nanoparticles (NPs) and FePt-Fe3O4 dumbbell shaped NPs, which are prepared by a facile one-pot synthesis method. High temperature annealing in argon is first used to convert FePt in FePt-Fe3O4 dumbbell shaped NPs to the L10-FePt phase. Then Fe3O4 in FePt-Fe3O4 dumbbell shaped NPs is reduced to bcc-Fe by low temperature annealing in reducing gas, forming L10-FePt-Fe nanocomposites. The L10-FePt-Fe nanocomposites exhibit both large coercivity and high magnetic moment. The work demonstrates that creating a nanoscale gradient interface between magnetically hard and soft phases is a promising approach for the fabrication of high performance permanent magnets.

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From FePt-Fe₃O₄ to L1₀-FePt-Fe nanocomposite magnets with a gradient interface

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