Abstract
The ultrafine grain size with a narrow size distribution is a critical issue for the development of L10-FePt thin films as ultrahigh density magnetic recording media. In this study, we succeeded in reducing both the grain size and the ordered domain size of L10-FePt thin films and simultaneously improving the size uniformity by annealing disordered FePt thin films at a high pressure of 1 GPa. This is attributed to the fact that high pressure promotes the nucleation of the L10 ordered domains and inhibits the growth of both the grains and the ordered domains during the L10 ordering transition.
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