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Operating interfaces to synthesize L10-FePt@Bi-rich nanoparticles by modifying the heating process
Ling Chang1,2, Chun Wu3,4, Qunshou Wang3
1Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China. wangq@mail.neu.edu.cn.
Nanoscale
|August 2, 2022
Summary
Researchers developed a new wet-chemical synthesis strategy for L10-FePt nanoparticles. This method controls interfaces to achieve high ordering in the magnetic nanoparticles.
Area of Science:
- Materials Science
- Nanotechnology
- Physical Chemistry
Background:
- High ordering in L10-FePt nanoparticles is crucial for applications in data storage and biomedical fields.
- Controlling interfaces during nanoparticle synthesis is key to achieving desired material properties.
- Existing wet-chemical synthesis methods for L10-FePt nanoparticles face challenges in controlling phase ordering and interface formation.
Purpose of the Study:
- To propose a facile strategy for operating interfaces during the synthesis of L10-FePt@Bi-rich nanoparticles (NPs).
- To investigate the role of mismatched and coherent interfaces in achieving the high ordering L10-FePt structure.
- To optimize heating rates during synthesis for improved phase uniformity and disorder-order transition.
Main Methods:
- Wet-chemical synthesis of L10-FePt@Bi-rich nanoparticles.
- Controlled manipulation of heating rates during different temperature stages (120 °C to 310 °C and higher).
- Characterization of nanoparticle interfaces, phase composition, and ordering using advanced microscopy and spectroscopy techniques (implied).
Main Results:
- A strategy was developed to control two critical interfaces: mismatched interfaces between γ-PtBi2 nuclei and fcc-FePt, and in situ grown coherent interfaces between L10-FePt and Bi-rich phases.
- Increasing heating rates from 120 °C to 310 °C promoted mismatched interface formation and improved NP uniformity.
- Reducing heating rates at higher temperatures facilitated Bi diffusion, enabling the disorder-order transition for L10-FePt NPs.
Conclusions:
- The proposed interface-operating strategy offers a new perspective for synthesizing highly ordered L10-FePt nanoparticles.
- Precise control over heating profiles is essential for managing interface evolution and achieving the desired L10 phase.
- This approach enhances the uniformity and phase ordering of FePt-based magnetic nanoparticles.
