SPIN-POLARIZED X-RAY-EMISSION SPECTROSCOPY OF CAPPED THIN CO FILMS ONCU(100)

The theory of valence band X-ray emission spectroscopy (XES) is discus sed in terms of spin-polarized fully relativistic multiple scattering. In comparison to the non spin-polarized case new theoretical features are presented with particular emphasis on the dependence of the inten sity on the polarization of the emitted photon. Applications to the L- 3 XES of a Co monolayer on Cu(100) substrate as capped by a monolayer of various 3d, 4d, and 5d transition metals are shown since such overl ayer systems display systematic variations of the magnetic moment in t he Co layer as well as in the cap layer. These changes are clearly map ped in the calculated XES and discussed in terms of transition cross s ections and local densities of states. (C) 1998 Elsevier Science Ltd. All rights reserved.