Elektronische Struktur und Vielteilchenkorrelation in Dreidimensionalenferromagneten untersucht mit spinpolarisierter Photoemissionsspektroskopie

The electronic structure of Nickel and the many-body correlation in different 3d-ferromagnets are investigated by the newly developed technique of spin-, angle-, and energy-resolved photoemission. This novel spectroscopy allowed for the first time a detailed comparison of spin-resolved photoemission spectra of Ni with quantitative photoemission calculations in a single-step model including correlation effects. These investigations also identified a controversial photoemission structure as a spin-split bulk state. This structure was interpreted heretofore as a majority-spin surface state in spin-integrated photoemission. The comparison of correlation effects in Auger- and satellite-structures of different ferromagnets (Ni, Ni$_{3}$Fe, Fe$_{44}$Ni$_{37}$B$_{19}$, Fe$_{82}$B$_{12}$Si$_{6}$)gives evidence for the influence of neighbour atoms on the Coulomb correlation energy of the 3d-electrons