Core-shell-core nanoparticle system, method of preparing core-shell-core FeCo / SiO2 / MnBi nanoparticle system, and core-shell-core nanoaggregates of FeCo / SiO2 nanoparticles with MnBi nanoparticles

摘要

Core-shell-core nanoparticles of an iron-cobalt alloy core, a silica shell and a manganese bismuth alloy core or nanoparticle on the surface of the silica shell (FeCo/SiO2/MnBi) are provided. The core-shell-core nanoparticles are alternative materials to rare-earth permanent magnets because of the hard magnetic manganese bismuth in nanometer proximity to the soft magnetic iron cobalt.