Analysis of optical magnetoelectric effect in GaFeO_3

Abstract

We study the optical absorption spectra in a polar ferrimagnet GaFeO_3. We consider the E1, E2 and M1 processes on Fe atoms. It is shown that the magnetoelectric effect on the absorption spectra arises from the E1-M1 interference process through the hybridization between the 4p and 3d states in the noncentrosymmetry environment of Fe atoms. We perform a microscopic calculation of the spectra on a cluster model of FeO_6 consisting of an octahedron of O atoms and an Fe atom displaced from the center with reasonable values for Coulomb interaction and hybridization. We obtain the magnetoelectric spectra, which depend on the direction of magnetization, as a function of photon energy in the optical region 1.0-2.5 eV, in agreement with the experiment.

18 pages, 5 figures

References in corpus (2)

• X-ray Dichroism in Noncetrosymmetric crystals
• Parity and Time-Reversal Breaking Effects on Resonant X-Ray Scattering at the Fe Pre-K-Edge in Magnetite

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• Magnetic Multipoles in a Ruthenate Ca3Ru2O7
• Circular dichroism of second harmonic generation response
• Superchiral photons unveil magnetic circular dichroism
• Second harmonic generation in a polar ferrimagnet GaFeO3
• Antiferromagnetic iron based magnetoelectric compounds