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Updated: Feb 25, 2026

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Stabilizing Fe Nanoparticles in the SmCo5 Matrix
Bo Shen1, Adriana Mendoza-Garcia1, Sarah E Baker2
1Department of Chemistry, Brown University , Providence, Rhode Island 02912, United States.
Abstract:
We report a new strategy for stabilizing Fe nanoparticles (NPs) in the preparation of SmCo5-Fe nanocomposites. We coat the presynthesized Fe NPs with SiO2 and assemble the Fe/SiO2 NPs with Sm-Co-OH to form a mixture. After reductive annealing at 850 °C in the presence of Ca, we obtain SmCo5-Fe/SiO2 composites. Following aqueous NaOH washing and compaction, we produced exchange-coupled SmCo5-Fe nanocomposites with Fe NPs controlled at 12 nm. Our work demonstrates a successful strategy of stabilizing high moment magnetic NPs in a hard magnetic matrix to produce a nanocomposite with tunable magnetic properties.
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