Abstract
Local structural anisotropy of Tb/Fe multilayers (MLs) was investigated by extended X-ray absorption fine structure (EXAFS) spectroscopy. Quantitative analysis of Fe EXAFS signals was performed to estimate the coordination number related to the structural anisotropy. A difference in the Fourier-transformed Fe EXAFS spectra between two incident polarized light directions has indicated that considerable anisotropy of atomic pair ordering exists in the MLs prepared by sputtering. It was further found that the variation of the structural anisotropy well corresponds to the magnitude of the perpendicular magnetic anisotropy, which changes depending on the bilayer periods and the preparation condition.
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