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

Title
Structural and magnetic properties of electrospun FeCoNi magnetic nanofibers with nanogranular phases
Authors
Ji Hea Park권순철김상우
Keywords
nanofibers; FeCoNi alloy; Structural properties; magnetic properties; electrospinning; nanogranular phases; Saturation magnetization; Coercivity
Issue Date
2012-02
Publisher
Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology
Citation
VOL 14, NO 2, 729-1-729-9
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−xNix 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.
URI
http://pubs.kist.re.kr/handle/201004/43263
ISSN
13880764
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