Stabilizing Fe Nanoparticles in the SmCo 5 Matrix

• Published in: Nano letters Vol. 17; no. 9; pp. 5695 - 5698
• Main Authors: Shen, Bo, Mendoza-Garcia, Adriana, Baker, Sarah E, McCall, Scott K, Yu, Chao, Wu, Liheng, Sun, Shouheng
• Format: Journal Article
• Language: English
• Published: United States 13-09-2017
• Subjects: compaction; nanocomposite; Magnetic material; rare-earth hard magnet; nanoparticle stability
• ISSN: 1530-6984; 1530-6992
• DOI: 10.1021/acs.nanolett.7b02593

We report a new strategy for stabilizing Fe nanoparticles (NPs) in the preparation of SmCo
-Fe nanocomposites. We coat the presynthesized Fe NPs with SiO
and assemble the Fe/SiO
NPs with Sm-Co-OH to form a mixture. After reductive annealing at 850 °C in the presence of Ca, we obtain SmCo
-Fe/SiO
composites. Following aqueous NaOH washing and compaction, we produced exchange-coupled SmCo
-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.