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

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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 languageEnglish (US)
Pages (from-to)7075-7080
Number of pages6
JournalJournal of Materials Chemistry C
Volume3
Issue number27
DOIs
Publication statusPublished - Jul 21 2015

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ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

Cite this

Yang, W., Lei, W., Yu, Y., Zhu, W., George, T. A., Li, X. Z., ... Sun, S. (2015). From FePt-Fe3O4 to L10-FePt-Fe nanocomposite magnets with a gradient interface. Journal of Materials Chemistry C, 3(27), 7075-7080. https://doi.org/10.1039/c5tc01145k