Abstract
We have measured and analyzed Co K-edge X-ray absorption near edge structure (XANES) and X-ray magnetic circular dichroism (XMCD) near edge spectra in crystalline and amorphous GdCo2 alloys. We have used a semi-relativistic full multiple scattering approach to the analyses of the XMCD spectra. A general formula is obtained which is applicable to randomly oriented systems in space. Useful information is obtained on both the electronic and geometric structure around a Co atom. The difference in XANES and XMCD spectra between crystalline and amorphous GdCo2 is well explained by models referring to the anomalous X-ray scattering result, where three Gd atoms in the second shell are removed away. The calculated XANES are not so sensitive to the electronic structure, whereas the calculated XMCD spectra are rather sensitive to the spin polarization on Co atoms. The result shows that the spin polarization on Co atoms in GdCo2 alloys is smaller than that in Co metals.
Original language | English |
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Pages (from-to) | 89-98 |
Number of pages | 10 |
Journal | Journal of Electron Spectroscopy and Related Phenomena |
Volume | 125 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2002 Aug |
Externally published | Yes |
Keywords
- Amorphous GdCo
- Crystalline GdCo
- Full multiple scattering theory
- XANES
- XMCD
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Radiation
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Spectroscopy
- Physical and Theoretical Chemistry