Thanks to the development of a new technique of polarization modulation of synchrotron radiation experiment, efficient measurements of magneto-optical effects of magnetic surfaces and interfaces become now possible [1]. In particular, the measurements using resonant scattering such as resonant magneto-optical Kerr effects (RMOKE) combined with this technique are now powerful tools to investigate the detailed electronic and magnetic properties of these systems. In the first part of this talk, first-principles calculations on X-ray absorption and magnetic circular dichroism (XMCD), X-ray resonant scattering and resonant MOKE are briefly reviewed. In the second part, the results of first-principles calculation related to the RMOKE experiments that have been performed recently by Matsuda’s group (ISSP) are presented. The difficulty of the calculation of such spectra with photon energy of ~1 keV lies in the fact that it is necessary to perform accurate relativistic calculations of the deep cores as well as valence states up to ~100 eV above the Fermi edge in the same framework. Also since the magnetic dichroism is usually much smaller than the absorption or scattering itself, rather precise calculations are required. In order to cope with these, the KKR Green’s function method combined with the linear response theory has been exploited. If time is allowed, the efforts to extend the study to non-linear optical effects targeting the resonant second harmonics generation will be explained.

Reference:
[1] Y. Kubota, et al. to be submitted (2017)

Lecture Language: English