MAGNETIC LINEAR DICHROISM AND SPIN POLARIZATION IN 3D-BAND PHOTOEMISSION

Spin-orbit effects in normal photoemission from ferromagnetic cubic (001) surfaces with in-plane magnetization ($) over right arrow M have been studied by symmetry considerations and by relativistic one-step-model Green-function calculations for d-band emission from Ni(001). Spin-averaged spectra due to s-polarized light in two orthogonal states show an intensity asymmetry, i.e., magnetic linear dichroism (MLD). For off-normally-incident p-polarized light, there is another type of MLD, which is maximal for ($) over right arrow M normal, and zero for ($) over right arrow M parallel to the plane of incidence. In the latter case, the electron spin polarization ($) over right arrow P has components exclusively due either to spin-orbit coupling or exchange. Individual spectral features are explained by the relativistic bulk band structure and by analytical considerations.