Magnetic EXAFS (MEXAFS) at the Fe K-edge in DyFe2 powder and an Fe thin film were measured. In order to derive a ferrimagnetic coupling of spin moments between Dy and Fe from MEXAFS spectra, novel analysis for MEXAFS has been tried. The σ(r) profiles which are defined as the difference between the absolute values of Fourier transformed k3χ+ (k) and k3χ- (k) were calculated for the measured spectra. χ+ (k) and χ-(k) are EXAFS functions when the correlation between a X-ray beam and a magnetic field applied to a sample is parallel and anti-parallel, respectively. The σ(r) has well described the distribution of spin polarization with its sign for ferrimagnetic DyFe2. A simulated distribution profile, in which only spin moments were considered, has been compared with the σ(r) in DyFe2 and a good coincidence between them has been obtained. The σ(r) profile for an Fe thin film completely reflects the ferromagnetic character and this result supports the validity of the present analysis.
- Atomic X-ray absorption fine structure
- Extended X-ray absorption fine structure
- Magnetic circular dichroism
- Multi-electron excitation
- Synchrotron radiation
ASJC Scopus subject areas
- Physics and Astronomy(all)