Surface vs. bulk magnetic moments from photoemission dichroism

The value of the surface spin magnetic moment of Fe(100) is obtained by mea suring the energy spread of the photoemission dichroism spectra of Fe3p cor e levels from bulk and surface. The bulk and surface signals have been reso lved exploiting the photoemission diffraction effects in a linear magnetic dichroism of the angular distribution (LMDAD) experiment with soft X-rays. The LMDAD lineshape and energy width of the bulk contribution has been inde pendently obtained from angular and from photon energy dependent experiment s: it provides a gauge for determining the magnetic moment of the surface F e3p atoms in the hypothesis of a linear dependance between energy width of dichroism and local spin magnetic moment. (C) 2000 Elsevier Science Ltd. Al l rights reserved.