Circular Magnetic X-Ray Dichroism at Fe K-Edges in Rare-Earth Iron Garnets

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概要

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• We propose a mechanism for circular magnetic X-ray dichroism (CMXD) in a pre-edge region of the Fe K-edge in rare-earth iron garnets, within a cluster approximation. The pre-edge absorption is assumed to be dominated by the electric-dipole transition from 1s states to 4p states mixed with 3d states of Fe ions through the hybridization between these orbitals and 2p orbitals of nearest-neighbor O ions. Considering the different symmetries and the different spin orientations for Fe ions at the tetrahedral (T_d) site and at the octahedral (O_h) site, we calculate CMXD for both cases based on T_d and O_h iron-oxygen clusters. It is found that CMXD is a manifestation of the combined effect of the spin-orbit coupling and the spin polarization in the 3d orbitals. The result is discussed in connection with experimental observations.

• 社団法人日本物理学会の論文
• 1994-04-15

著者

• Harada Isao

  Department Of Physics Faculty Of Science Kobe University

• Kotani Akio

  Institut De Physique Et Chimiedes Materiaux De Strasbourg Cnrs

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