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Structural and Magnetic Properties of FePt/SiO2 Core/Shell Nanoparticles

  • Jie Hua
  • Haibo Cheng
  • Kewei Zhang
  • Yumei Zhang
  • Haibo LiEmail author
Original Paper
  • 50 Downloads

Abstract

The disorder-order phase transition of FePt/SiO2 core/shell nanoparticles (NPs) induced by rapid thermal annealing was investigated. The FePt/SiO2 NPs were synthesized using FePt cores as seeds. For as-prepared FePt/SiO2 NPs, the average size of the FePt core and the thickness of the SiO2 shell are about 4.8 and 1.2 nm respectively, and the FePt NPs exhibit a disordered fcc structure. The FePt core NPs show obvious phase transformation from a disordered to an ordered structure after they were annealed at 600 °C for 2 min. Moreover, increasing annealing time can promote effectively the formation of the ordered fct-FePt phase. The relatively large coercivity \(H_{\mathrm {c}}\) is obtained for FePt NPs with a thicker SiO2 shell. The \(H_{\mathrm {c}}\) decreases firstly with decreasing temperature from 300 to 100 K and then increases from 100 to 10 K, which is ascribed to the coexistence of magnetically hard fct-FePt and magnetically soft fcc-FePt in the sample, and the incomplete exchange coupling between the hard and soft magnetic phases.

Keywords

FePt/SiO2 Core/shell structure Phase transition Magnetic property 

Notes

Funding Information

This work was supported by the National Natural Science Foundation of China (No. 21371071).

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of EducationJilin Normal UniversitySipingChina

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