Abstract
Addition of Cu into Fe∕Pt bilayered structure causes high coercivity and large magnetic anisotropy in the perpendicular direction when the thickness of the bilayer is less than 6nm. In the thickness range less than 4nm, Pt∕Fe bilayered films with Cu added annealed at 600°C in hydrogen atmosphere exhibits larger coercivity than the bilayer without Cu added. Pure Pt∕Fe bilayered film exhibits relatively small coercivity, less than 4kOe, and no perpendicular magnetic anisotropy in this range. On the other hand, Pt(Cu)∕Fe bilayered film exhibits large coercivity of 5kOe and relatively higher perpendicular magnetic anisotropy in the thickness range more than 5nm. Pt(Cu)∕Fe bilayered film can be expected to be applied to thin magnetic recording layer below 4nm or less.
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