Multiple scattering approach to Co K-edge XMCD and XANES spectra in Gd-Co alloys

Izumi Yamamoto, Shin ichi Nagamatsu, Tetsuya Nakamura, Takashi Fujikawa, Susumu Nanao

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

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 languageEnglish
Pages (from-to)89-98
Number of pages10
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume125
Issue number2
DOIs
Publication statusPublished - 2002 Aug
Externally publishedYes

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

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