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Tailoring FePt-Fe3O4 exchange spring coupling magnet in silica

C.H. Yu, C.C.H. Lo, K.Y. Tam and S.C. Tsang
University of Reading, UK

Keywords:
exchange spring coupling, nano-magnet, encapsulation

Abstract:
We report the optimization of exchange spring coupling of
FePt/Fe3Pt nanocomposites via independently tuning their size and composition by a micro-emulsion method. These nanocomposites are deliberately placed in each silica
nano-spheres such that the problem of their sintering is substantially reduced by the presence of silica overlayers during annealing of the mixture. As a result, size tailoring
of FePt/Fe3Pt in their L10/L12 phases respectively, can be, for the first time, demonstrated.

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