Spin-polarized core photoelectron diffraction from magnetic and non-magnetic surface layers

Abstract

A method is considered to calculate core photoelectron spectra including multiple scattering contributions and all curved wave corrections. Furthermore this method allows to calculate the spectra in dependence on the polarization (linearly or circularly) of the X-ray beam and on the spin-polarization of the photoelectrons. The results show that the spin-polarized spectra give more detailed information on the structure of the surface layer. Results are shown for the Sb 4 d 3 2 and 4 d 5 2 spectra of the Sb InP(110) surface where we found a strong circular dichroism of the spin-polarization. Furthermore the system Cr Ag(100) is investigated where experimental spectra are available for the Cr 2 p 1 2 level. In this case it is shown to what extent the spectra depend on the orientation of the magnetization of the Cr layers besides the dichroism. The results should encourage experimentalists to do spin-polarized measurements with circularly polarized light.