MAGNETIC-PROPERTIES OF MULTIPLE-STRUCTURE MULTILAYERED CO/PD FILMS

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 angstrom 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 angstrom.