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Controlled Morphologies and Intrinsic Magnetic Properties of Chemically Synthesized Large-Grain FeCo Particles

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Abstract

The high-purity FeCo particles with particle size ranging from 100 nm to 5 μm are fabricated using a direct chemical method. The controlled morphologies of the FeCo samples vary from nearly-spherical to urchin-like or cubic shape under optimal reaction conditions. Very slight surface oxidation is observed in these large-grain FeCo particles. It shows a low coercivity with 91 Oe for the nearly-spherical FeCo particles, while a much higher coercivity of 236 Oe is observed in the urchin-like samples, which can be mainly ascribed to their different morphologies and particle sizes. High saturation magnetization of 205–211 A/m2/kg can be achieved in these micron-level FeCo particles due to their high purity and single body-centered cubic (bcc) phase structure. The composition-controlled FeCo particles with different Fe/Co atom ratios can be obtained by adjusting the reaction temperature, which results in their variable saturation magnetization. The relative simple and low-cost chemical synthesis of large-grain FeCo particles promise their potential use in complicated shape and miniaturized FeCo-based magnetic components.

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Acknowledgments

This work was supported by Beijing Natural Science Foundation under Grant No. 2132039, the National Nature Science Foundation of China under Grant No. 51101007, and the National Basic Research Program of China (973 Program) under Grant No. 2010CB934602.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Beihang University, Beijing, 100191, China

    Ying Cao, Bai Yang, Xueying Yang, Lei Zhang, Rongfeng Li & Ronghai Yu

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  1. Ying Cao
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  2. Bai Yang
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  3. Xueying Yang
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  4. Lei Zhang
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  5. Rongfeng Li
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  6. Ronghai Yu
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Correspondence to Bai Yang.

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Cao, Y., Yang, B., Yang, X. et al. Controlled Morphologies and Intrinsic Magnetic Properties of Chemically Synthesized Large-Grain FeCo Particles. J Supercond Nov Magn 28, 1863–1869 (2015). https://doi.org/10.1007/s10948-015-2980-2

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  • DOI: https://doi.org/10.1007/s10948-015-2980-2

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