Synthesis and Fabrication of a Thin Film Containing Silica-Encapsulated Face-Centered Tetragonal FePt Nanoparticles


  • This work is funded by EPSRC and AstraZeneca in the UK. CHY thanks the co-sponsorship for a PhD from University of Reading and AstraZeneca. The support of this work with SuperSTEM microscopic facilities at National Daresbury laboratory, UK, is also acknowledged. Supporting Information is available online from Wiley InterScience or from the author.


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Self-assembly of monodisperse, silica-encapsulated, face-centered tetragonal FePt nanoparticles forms closely packed 2D arrays (see figure). Placing monodisperse FePt nanoparticles in silica nanocapsules allows the transition from a disordered face-centered cubic phase to a ferromagnetic crystalline face-centered tetragonal structure at elevated temperature without severe sintering. These materials are potential candidates for the generation of ultrahigh-density magnetic recording media.