Preparation of Fe-Pt perpendicular magnetic thin films on glass substrates were examined, aiming at thermally stable media in future high density recording. It was found that high pressure sputter-deposition and an underlayer of Cr(200) were essential to obtain an ordered fct structure and control the c-axis of the crystal structure to the film normal, respectively. The FePt film with perpendicular magnetic anisotropy having a coercivity of 7.3 kOe and a saturation magnetization of over 600 emu/cm3 was successfully obtained. In the case of direct deposition onto a glass substrate, the film had a high squareness and a large coercivity in both the perpendicular and longitudinal directions, while the crystal orientation was almost random.
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Honda et al. (1997) studied this question.
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