Anisotropic SmCo<sub>5</sub>/FeCo core/shell nanocomposite chips prepared via electroless coating

Narayan Poudyal; Kinjal Gandha; Kevin Elkins; J. Ping Liu; Narayan Poudyal; Kinjal Gandha; Kevin Elkins; J. Ping Liu

doi:10.3934/matersci.2015.3.294

AIMS Materials Science

2015, Volume 2, Issue 3: 294-302. doi: 10.3934/matersci.2015.3.294

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Anisotropic SmCo₅/FeCo core/shell nanocomposite chips prepared via electroless coating

Department of physics, University of Texas at Arlington, Arlington, Texas 76019

Received: 28 February 2015 Accepted: 24 August 2015 Published: 31 August 2015

We report the preparation of anisotropic SmCo₅/FeCo core/shell nanocomposite chip-like particles via an electroless coating process. The anisotropic SmCo₅ nanoscale chips were first prepared by surfactant-assisted ball milling then coated with soft magnetic FeCo using cobalt sulfate (CoSO₄.7H₂O) and iron sulfate (FeSO₄.7H₂O) as metal precursors in presence of complexing agents. The influence of the soft-phase coating on the magnetic properties of the nanocomposite particles has been studied. The saturation magnetization of the composite particles increases with increasing coating while the coercivity decreases. The FeCo coated chips have an enhanced remanence (M_r = 44.5 emu/g with 16 wt % of FeCo) compared to the uncoated chips (M_r = 36.7 emu/g), indicating exchange coupling between the hard and soft phases for the optimal soft-phase coating. Results of magnetic field alignment show the strong anisotropy of SmCo₅/FeCo core/shell nanocomposite particles which can be used as building blocks of high-strength anisotropic magnets.
- core/shell nanoparticles,
- anisotropic magnetic nanoparticles,
- hard magnetic nanoparticles,
- nanocomposite magnets,
- electroless coating
Citation: Narayan Poudyal, Kinjal Gandha, Kevin Elkins, J. Ping Liu. Anisotropic SmCo5/FeCo core/shell nanocomposite chips prepared via electroless coating[J]. AIMS Materials Science, 2015, 2(3): 294-302. doi: 10.3934/matersci.2015.3.294

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Abstract

We report the preparation of anisotropic SmCo₅/FeCo core/shell nanocomposite chip-like particles via an electroless coating process. The anisotropic SmCo₅ nanoscale chips were first prepared by surfactant-assisted ball milling then coated with soft magnetic FeCo using cobalt sulfate (CoSO₄.7H₂O) and iron sulfate (FeSO₄.7H₂O) as metal precursors in presence of complexing agents. The influence of the soft-phase coating on the magnetic properties of the nanocomposite particles has been studied. The saturation magnetization of the composite particles increases with increasing coating while the coercivity decreases. The FeCo coated chips have an enhanced remanence (M_r = 44.5 emu/g with 16 wt % of FeCo) compared to the uncoated chips (M_r = 36.7 emu/g), indicating exchange coupling between the hard and soft phases for the optimal soft-phase coating. Results of magnetic field alignment show the strong anisotropy of SmCo₅/FeCo core/shell nanocomposite particles which can be used as building blocks of high-strength anisotropic magnets.

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