Effects of annealing time on structural and magnetic properties of L10-FePt nanoparticles synthesized by the SiO2-nanoreactor method

TL;DR

This study explores how annealing time influences the structure and magnetism of L10-FePt nanoparticles synthesized via the SiO2-nanoreactor method, highlighting optimal conditions for high coercivity and crystallinity.

Contribution

It demonstrates that annealing at 900°C for 9 hours produces fully crystallized L10-FePt nanoparticles with high coercivity and preserved particle size, advancing their application in data storage.

Findings

Complete transformation to L10 structure at 9 hours annealing

High coercivity achieved in well-crystallized nanoparticles

Particles remain monodisperse after annealing

Abstract

We investigated effects of annealing time on structural and magnetic properties of the L10-FePt nanoparticles synthesized by the SiO2-nanoreacter method. The magnetization and powder X-ray diffraction studies revealed that the annealing at 900 oC for 9 hr could convert all of the fcc-nanoparticles to the well-crystallized L10 structure with a large coercivity while keeping their particle size. Such monodisperse and highly crystalline L10-FePt nanoparticles are a promising material for the realization of ultra-high density recording.