Site specification on normal and magnetic XANES of ferrimagnetic Fe3O4 by means of resonant magnetic Bragg scattering

Abstract

Resonant magnetic Bragg scattering (RMBS) for several reflections has been measured at the Fe K-edge in Fe3O4. The normal and magnetic X-ray absorption near-edge structure (XANES) for two types of Fe ion site (tetrahedral and octahedral) were successfully determined from the analysis of DAFS and RMBS spectra on the assumption that there was an electric dipole transition. The obtained normal XANES for the octahedral site is well explained as a mixture of Fe2+ and Fe3+ ions, and the characteristic feature of the magnetic XANES at the pre-edge peak is mainly contributed from the Fe3+ ion at the tetrahedral site.