Directional Dichroism of X-Ray Absorption in a Polar Ferrimagnet GaFeO_3

Abstract

We study the directional dichroic absorption spectra in the x-ray region in a polar ferrimagnet GaFeO_3. The directional dichroism on the absorption spectra at the Fe pre-K-edge arises from the E1-E2 interference process through the hybridization between the 4p and 3d states in the noncentrosymmetric environment of Fe atoms. We perform a microscopic calculation of the spectra on a model of FeO_6 with reasonable parameter values for Coulomb interaction and hybridizations. We obtain the difference in the absorption coefficients when the magnetic field is applied parallel and antiparallel to the c axis. The spectra shus obtained have similar shapes to the experimental curves as a function of photon energy in the Fe pre-K-edge region, although they have opposite signs.

14 pages, three figures

References in corpus (4)

• Analysis of optical magnetoelectric effect in GaFeO_3
• Analysis of resonant inelastic x-ray scattering at the $K$ edge in NiO
• Theoretical Analysis of Resonant Inelastic X-Ray Scattering Spectra in LaMnO3
• Parity and Time-Reversal Breaking Effects on Resonant X-Ray Scattering at the Fe Pre-K-Edge in Magnetite

Cited by in corpus (2)

• Resonant x-ray scattering from chiral materials, $\alpha$-quartz and $\alpha$-berlinite
• Second harmonic generation in a polar ferrimagnet GaFeO3