The magnetic circular dichroism (MCD) of resonant x-ray emission spectroscopy (RXES) was studied for the Sm L3M4,5 and L2M4 optical processes in a ferromagnetic Sm21Co79 amorphous alloy. The MCD of RXES (MCDRXES) originating from the optical process of 2p63d104fn→2p5 3d104fn+1→2p6 3d94fn+1, which corresponds to dipolar decay after quadrupolar (E2) excitation, was obviously observed at the preedge region in addition to that of the normal dipolar (E1) excitation. Moreover, the E2 contribution of the MCD has been separated into those for E2 excitation to the Sm 4f state with majority and minority spins. A theoretical calculation based on a formula of the coherent second-order optical process was carried out for all of the experimental MCDRXES spectra. In the calculation, the multiplet coupling effect and the enhancement of the 2p-5d dipole matrix elements proposed for the MCD of x-ray absorption were taken into account. The calculated MCDRXES spectra reproduced all of the experimental results very successfully. The present result provided an appropriate interpretation of the origins of the MCD effect, which comes from the E1 and the E2 contributions at both the L3 and the L2 edges.
|Number of pages
|Physical Review B - Condensed Matter and Materials Physics
|Published - 2003 Mar 1