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Chemical synthesis and characterization of SmCo5/Co magnetic nanocomposite particles

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Abstract

Magnetic nanocomposite material has been widely focused for the potential to become the next generation of magnetic material. In this paper, two kinds of chemical coating methods were used to prepare SmCo5/Co nanocomposite particles which were further characterized and compared. The two methods were carried out by using different materials and at different temperatures. In Method I, oleylamine (OAm), oleic acid and Ca(acac)2 were used and the reaction was carried out at the temperature of 300 °C. In Method II, anhydrous isopropanol, polyvinylpyrrolidone (PVP), N2H4·H2O and CoCl2·6H2O were used and the reaction temperature was ~ 55 °C. It was found that by using the two methods, the growth and the crystal structure of the Co nanoparticles (NPs) are different. In Method I, epitaxial growth on the surface of SmCo5 NPs was observed and the Co NPs were in a face-centered close packing crystal structure. While in Method II, the coated Co NPs were self-nucleated with a crystal structure of hexagonal close packing. Using Method II with the addition of surfactant, anisotropic nanocomposite particles were achieved with an enhanced saturated magnetization of 84.2 A·m2·kg−1. And the coercivity change of the NPs illustrates that a nonmagnetic interlayer between the hard and soft magnetic phase is beneficial to maintain the coercivity.

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Acknowledgements

This work was financially supported by the National Key R&D Program of China (No. 2018YFB2003901), and National Natural Science Foundations of China (NSFC) (No. 51520105002).

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Authors and Affiliations

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

    Ying Dong, Tian-Li Zhang, Hui Wang, Xin Liu & Cheng-Bao Jiang

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  1. Ying Dong
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  2. Tian-Li Zhang
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  3. Hui Wang
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  4. Xin Liu
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  5. Cheng-Bao Jiang
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Correspondence to Cheng-Bao Jiang.

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Dong, Y., Zhang, TL., Wang, H. et al. Chemical synthesis and characterization of SmCo5/Co magnetic nanocomposite particles. Rare Met. 40, 1224–1231 (2021). https://doi.org/10.1007/s12598-020-01640-w

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