Abstract
Magnetically exchange coupled SrFe12O19/Fe-Co composites with different mass percentage of Fe-Co were synthesized through an ex situ process. The morphology, magnetic properties, and crystallization of SrFe12O19/Fe-Co composites were investigated. Lower mass percentage of Fe-Co presented an even distribution of Fe-Co nanoparticles on the surface of SrFe12O19, and effective magnetic exchange coupling between Fe-Co and SrFe12O19. Higher mass percentage of Fe-Co leads to an agglomeration of Fe-Co nanoparticles on SrFe12O19 surface, and a weak magnetic exchange coupling between Fe-Co and SrFe12O19. This ex situ process proposed a new method to synthesize magnetically exchange coupled SrFe12O19/Fe-Co core/shell composites with precise control of the magnetic properties. This method can also be potentially used for other hard/soft magnetic composite synthesis.
Highlights
The rare-earth free permanent magnets have been a great research interest due to the limited supplies and unstable prices of rare-earth elements in the market
Exchange coupled SrFe12O19/Fe-Co composites with different mass percentage of Fe-Co were synthesized through an ex situ process
This paper reports an ex situ synthesis of magnetically exchange coupled SrM/Fe-Co composites
Summary
The rare-earth free permanent magnets have been a great research interest due to the limited supplies and unstable prices of rare-earth elements in the market. In EG was further confirmed in another research of synthesis of hollow mesoporous BaFe12O19 particles through high temperature EG etching.[3] Losing SrM during SrM/Fe-Co core/shell composite particle synthesis brings a great challenge to control the mass ratio between the hard and soft phases, and tailor the magnetic properties of the products. To solve this problem, an ex situ synthesis of SrM/Fe-Co core/shell particles was reported in this paper. The advantage of ex situ synthesis method is that the loss of SrM is prevented by separating Fe-Co nanoparticle synthesis and SrM/Fe-Co magnetic self-assembly process in different environments
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call