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Structural and magnetic properties of electrospun FeCoNi magnetic nanofibers with nanogranular phases

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Abstract

Structural and magnetic properties of silicon/aluminum-added and -free FeCoNi magnetic alloy nanofibers with nanogranular phases prepared by electrospinning and subsequent annealing of the PVP-blended ternary metal precursors in hydrogen atmosphere were investigated. The FeCoNi magnetic alloy nanofibers with evenly distributed nanocrystalline phases were formed, which are identified as γ-Fe1−x Ni x binary phase with face-centered cubic structure and α-CoFe phase with body-centered cubic structure. At elevated temperature, the α → γ structural martensitic transformation in the FeCoNi ternary alloys occurred due to the inhomogeneities in composition of the matrix during annealing of the alloy with metastable α-phase. In the Si/Al-added FeCoNi nanofibers, more than two phases with complicated-boundaries of the grains in and/or outside the nanofibers were formed as crystalline phases and amorphous phase. The amorphous phase consisted of Si and/or Al acted as an inhibitor diminishing α → γ transformation as well as an interparticle insulation layer. At low annealing temperature of 450 °C, the Si/Al-added nanofiber mainly consisted of metastable α-phase with a low-crystallinity surface structure and very small diameter of 13 nm was formed and showed an unexpectedly high coercivity, which attributed to the surface effects and/or high surface/volume ratio.

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Acknowledgments

We gratefully acknowledge financial support from the Ministry of Knowledge Economy and are also grateful to the Korea Institute of Science and Technology for partial support of this study.

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Authors and Affiliations

  1. Clean Energy Research Center, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil, SeongBuk-gu, Seoul, 136-791, South Korea

    Ji Hea Park, Soon C. Kweon & Sang Woo Kim

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  1. Ji Hea Park
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  2. Soon C. Kweon
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  3. Sang Woo Kim
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Correspondence to Sang Woo Kim.

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Park, J.H., Kweon, S.C. & Kim, S.W. Structural and magnetic properties of electrospun FeCoNi magnetic nanofibers with nanogranular phases. J Nanopart Res 14, 729 (2012). https://doi.org/10.1007/s11051-012-0729-4

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  • DOI: https://doi.org/10.1007/s11051-012-0729-4

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