Magnetic Circular Dichroism of Resonant X‐Ray Emission Spectroscopy Related to Er 2p → 4f Electric Quadrupolar Transition in Er3Fe5O12

For Er3+ ion in Er3Fe5O12, magnetic circular dichroism (MCD) of X‐ray emission spectra (XES) have been recorded in the pre‐edge region of the Er L3‐absorption edge. The XES‐MCD spectrum, consisting of the main peaks and their satellites, drastically varies with the incident angle of X‐ray. The angle‐dependent spectrum shows that the satellite structure originates from the electric quadrupolar 2p → 4f transition. The experimental result is compared with a theoretical calculation based on the atomic model.