Abstract
Equi-atomic Fe-Pt alloy thin films with the peculiar properties, such as high magnetic anisotropy, have been intensively studied because of their potential application as high-density magnetic recording media. These properties are achieved by formation of ordered (fct) phase. It was reported that an increase of coercivity (Hc) in multilayered Fe/Pt films occurs upon annealing at temperatures of 300 - 400 °C, which is remarkably low compared with those for single-layer Fe-Pt films and granular Fe-Pt-SiO2 films. In this study, we found that interdiffusion at the Fe/Pt interface occurs at lower temperatures when the Fe and Pt layer thickness is almost equal, and subsequently the multilayer structure transforms directly to the fct phase. These findings suggest a possibility of a low-temperature fabrication process for Fe-Pt media with a very high magnetic anisotropy energy.
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