Journal
NANO LETTERS
Volume 17, Issue 9, Pages 5695-5698Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b02593
Keywords
Magnetic material; nanocomposite; nanoparticle stability; rare-earth hard magnet; compaction
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Funding
- Critical Materials Institute, an Energy Innovation Hub - U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office
- LLNL [DE-AC52-07NA27344]
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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 degrees 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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