Magnetic EXAFSでみる磁性体の磁気構造

概要

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MCD measurement in extended X-ray absorption fine structure (EXAFS) energy range gives us information on the pair distribution of spin-polarized scattering sites around an absorption atom. Magnetic EXAFS at the Fe K-edge is presented for DyFe_2 powder and an Fe thin film, and the local magnetic structures are analyzed from the spectra. The positions and signs of peaks in the imaginary part of Fourier-transformed magnetic EXAFS agree well with those of conventional EXAFS for the iron thin film. In order to derive a ferrimagnetic coupling of spin moments between Dy and Fe from magnetic EXAFS spectra, the function σ(r) was defined as the difference between the absolute values of Fourier-transformed EXAFS functions for positive and negative helicities of circularly polarized X-rays. σ(r) accurately described the distribution of the spin polarization and its sign in ferrimagnetic DyFe_2.
社団法人日本磁気学会の論文
1999-04-01