One-pot synthesis of urchin-like FePd-Fe3O4 and their conversion into exchange-coupled L10-FePd-Fe nanocomposite magnets

Yongsheng Yu; Kewei Sun; Yuan Tian; X. Z. Li; M. J. Kramer; D. J. Sellmyer; J. E. Shield; Shouheng Sun

doi:10.1021/nl403043d

One-pot synthesis of urchin-like FePd-Fe₃O₄ and their conversion into exchange-coupled L1₀-FePd-Fe nanocomposite magnets

Yongsheng Yu, Kewei Sun, Yuan Tian, X. Z. Li, M. J. Kramer, D. J. Sellmyer, J. E. Shield, Shouheng Sun

Physics and Astronomy

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

72 Scopus citations

Abstract

We report a one-pot synthesis of urchin-like FePd-Fe₃O ₄ nanocomposites, spherical clusters of FePd nanoparticles (NPs) with spikes of Fe₃O₄ nanorods (NRs), via controlled thermal decomposition of Fe(CO)₅ and reduction of Pd(acac)₂. The FePd NPs with sizes between 6 and 9 nm self-aggregate into 60 nm superparticles (SPs), and Fe₃O₄ NRs grow on the surface of these SPs. Reductive annealing at 500 C converts the FePd-Fe₃O₄ into exchange-coupled nanocomposites L1₀-FePd-Fe with their H_c tunable from 0.8 to 2.6 kOe and M_s controlled from 90 to 190 emu/g. The work provides a general approach to L1₀-FePd-Fe nanocomposite magnets for understanding exchange coupling at the nanoscale. The concept may be extended to other magnetic nanocomposite systems and may help to build superstrong magnets for magnetic applications.

Original language	English (US)
Pages (from-to)	4975-4979
Number of pages	5
Journal	Nano Letters
Volume	13
Issue number	10
DOIs	https://doi.org/10.1021/nl403043d
State	Published - Oct 9 2013

Keywords

exchange coupling
nanocomposite magnets
nanocomposites
reductive annealing

ASJC Scopus subject areas

Bioengineering
Chemistry(all)
Materials Science(all)
Condensed Matter Physics
Mechanical Engineering

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10.1021/nl403043d

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title = "One-pot synthesis of urchin-like FePd-Fe3O4 and their conversion into exchange-coupled L10-FePd-Fe nanocomposite magnets",

abstract = "We report a one-pot synthesis of urchin-like FePd-Fe3O 4 nanocomposites, spherical clusters of FePd nanoparticles (NPs) with spikes of Fe3O4 nanorods (NRs), via controlled thermal decomposition of Fe(CO)5 and reduction of Pd(acac)2. The FePd NPs with sizes between 6 and 9 nm self-aggregate into 60 nm superparticles (SPs), and Fe3O4 NRs grow on the surface of these SPs. Reductive annealing at 500 C converts the FePd-Fe3O4 into exchange-coupled nanocomposites L10-FePd-Fe with their Hc tunable from 0.8 to 2.6 kOe and Ms controlled from 90 to 190 emu/g. The work provides a general approach to L10-FePd-Fe nanocomposite magnets for understanding exchange coupling at the nanoscale. The concept may be extended to other magnetic nanocomposite systems and may help to build superstrong magnets for magnetic applications.",

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author = "Yongsheng Yu and Kewei Sun and Yuan Tian and Li, {X. Z.} and Kramer, {M. J.} and Sellmyer, {D. J.} and Shield, {J. E.} and Shouheng Sun",

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AU - Sun, Kewei

AU - Tian, Yuan

AU - Li, X. Z.

AU - Kramer, M. J.

AU - Sellmyer, D. J.

AU - Shield, J. E.

AU - Sun, Shouheng

PY - 2013/10/9

Y1 - 2013/10/9

N2 - We report a one-pot synthesis of urchin-like FePd-Fe3O 4 nanocomposites, spherical clusters of FePd nanoparticles (NPs) with spikes of Fe3O4 nanorods (NRs), via controlled thermal decomposition of Fe(CO)5 and reduction of Pd(acac)2. The FePd NPs with sizes between 6 and 9 nm self-aggregate into 60 nm superparticles (SPs), and Fe3O4 NRs grow on the surface of these SPs. Reductive annealing at 500 C converts the FePd-Fe3O4 into exchange-coupled nanocomposites L10-FePd-Fe with their Hc tunable from 0.8 to 2.6 kOe and Ms controlled from 90 to 190 emu/g. The work provides a general approach to L10-FePd-Fe nanocomposite magnets for understanding exchange coupling at the nanoscale. The concept may be extended to other magnetic nanocomposite systems and may help to build superstrong magnets for magnetic applications.

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