Magnetic properties of multiple-structure multilayered Co/Pd films

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Abstract
Co/Pt and Co/Pd multilayered films exhibit large perpendicular magnetic anisotropy and have attracted attention as new materials for magneto-optical recording media and for applications in other areas. The coercivity and the squareness ratio of these films are small at thick films of 1000 Å or more. We studied Co/Pd multiple-structure multilayered films, consisting of periodic piles of Co/Pd multilayered film layers and Pd thin-film layers in order to improve the magnetic characteristics. By adopting such multiple structures, a squareness ratio of unity, coercivity of 2.5 kOe, and residual magnetization of 1.5 kG were obtained at a thick film of 2000 Å.