DIFFUSE INTERFACE AND STRAIN ANISOTROPY IN CO PD(111) MULTILAYERS BY POLARIZED EXAFS STUDY/

We examined interface structure of Co/Pd multilayers by quantitative a nalysis of fluorescence-yield Co K-edge EXAFS. To investigate the loca l atomic structure surrounding Co absorber and its anisotropy in ortho gonal directions, two polarization dependent set-ups were used. By mea ns of first shell analysis including distinct nearest neighbors of Co and Pd atoms, it was found that a considerable amount of Co-Pd alloy-l ike phase near interfaces of thin Co layers is formed by atomic scaled diffuseness of growing surface. Moreover, we found Co strain anisotro py depending on Co layer thickness, generally, tensile and compressive strains of in-plane and out-of-plane atoms, respectively. These inter face structures might critically affect the tendency of perpendicular magnetization in Co/Pd multilayers.