HARD-SOFT MAGNETIC MnBi/SiO2/FeCo 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.

主权项

1. A core-shell-core nanoparticle system, comprising:
a superparamagnetic core comprising an iron cobalt alloy; an intermediate shell of a silicon dioxide coating the core; an outer core of manganese bismuth alloy on the intermediate silicon dioxide shell; and a metal silicate interface layer between the core and the silicon dioxide shell; wherein a diameter of the iron cobalt alloy core is 200 nm or less.