Abstract
Co/Pd multilayered films with ultrathin layers of Co were prepared by alternating deposition in an ultrahigh‐vacuum physical‐vapor‐deposition system. The individual layer thicknesses of the samples were estimated making use of the angular positions of x‐ray diffraction peaks. The magnetic and magneto‐optical properties were found to vary depending on Pd buffer layer and Pd sublayer thicknesses, as well as Co sublayer thickness. Some of the films showed good properties for magneto‐optical medium, such as large perpendicular magnetic anisotropy and Kerr rotation, and perfect squareness of the magnetic hysteresis loop. The Pd‐predeposited films were found to have a remarkably high coercivity of 4723 Oe and a greatly enhanced interfacial magnetic anisotropy of 0.72 mJ/m2. The transition from in‐plane to perpendicular magnetic anisotropy took place at a Co sublayer thickness of 8.2 Å for the multilayer with Pd predeposition. Kerr rotation was inversely proportional to the Pd/Co sublayer thickness ratio, showing the maximum value of 0.12°. The magnetic and magneto‐optical properties were correlated systematically to the structural parameters of the multilayered films.
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