Method of preparing core-shell structured nanoparticle having hard-soft magnetic heterostructure

摘要

The present invention relates to a core-shell structured nanoparticle having hard-soft heterostructure, magnet prepared from the nanoparticle, and preparing method thereof. The core-shell structured nanoparticle having hard-soft magnetic heterostructure of present invention has some merits such as independence from resource supply problem of rare earth elements and low price and can overcome physical and magnetic limitations possessed by the conventional ferrite mono-phased material.

主权项

1. A method of preparing a core-shell structured nanoparticle having hard-soft heterostructure by using a sol-gel method, which comprises the following steps:
(i) obtaining a solution of slurry state comprising ferrite nanopowder and at least one selected from metal complex compound, metal salt, metal compound and metal nanoparticle; (ii) altering the solution into a viscous gel by evaporating its solvent; and (iii) forming a nanoparticle by heating the gel.