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Composition- and oxidation-controlled magnetism in ternary FeCoNi nanocrystals

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Abstract

Ternary FeCoNi metallic nanostructures have attracted significant attention due to their high saturation magnetization, unique mechanical properties, and large corrosion resistance. In this study, we report a controlled synthesis of ternary FeCoNi nanocrystals using solution-based epitaxial core–shell nanotechnology. The thickness and stoichiometry of the FeCoNi nanocrystals affect their magnetic characteristics, which can be controlled by a phase transformation-induced tetragonal distortion. Furthermore, surface oxidation of the stoichiometry-controlled FeCoNi nanostructures can drastically enhance their magnetic coercivity (up to 8,881.6 Oe for AuCu–FeCo), and optimize the AuCu–FeCo0.8Ni0.2 performance corresponding to the saturated magnetization of 134.4 emu·g−1 and coercivity of 4,036.7 Oe, which opens the possibility of developing rare-earth free high energy nanomagnets.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Temple University, Philadelphia, PA, 19122, USA

    Maogang Gong & Shenqiang Ren

  2. Department of Physics, Astronomy, and Materials Science, Missouri State University, Springfield, MO, 65897, USA

    Ridwan Sakidja

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  1. Maogang Gong
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  2. Ridwan Sakidja
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  3. Shenqiang Ren
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Correspondence to Shenqiang Ren.

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Gong, M., Sakidja, R. & Ren, S. Composition- and oxidation-controlled magnetism in ternary FeCoNi nanocrystals. Nano Res. 9, 831–836 (2016). https://doi.org/10.1007/s12274-015-0962-0

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  • DOI: https://doi.org/10.1007/s12274-015-0962-0

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