Single Domain SmCo₅@Co Exchange-coupled Magnets Prepared from Core/shell Sm[Co(CN)₆]·4H₂O@GO Particles: A Novel Chemical Approach

摘要

SmCo₅ based magnets with smaller size and larger maximum energy product have been long desired in various fields such as renewable energy technology, electronic industry and aerospace science. However, conventional relatively rough synthetic strategies will lead to either diminished magnetic properties or irregular morphology, which hindered their wide applications. In this article, we present a facile chemical approach to prepare 200?nm single domain SmCo₅@Co core/shell magnets with coercivity of 20.7?kOe and saturation magnetization of 82?emu/g. We found that the incorporation of GO sheets is responsible for the generation of the unique structure. The single domain SmCo₅ core contributes to the large coercivity of the magnets and the exchange-coupled Co shell enhances the magnetization. This method can be further utilized in the synthesis other Sm-Co based exchange-coupled magnets.