Spin-Bahn-Kopplung und zweidimensionale Zustände in ultradünnen, magnetischen Schichten

The aim of this thesis has been to determine the electronic structure atinterfaces between ferromagnetic and paramagnetic layers, in paramagneticoverlayers on ferromagnetic substrates, and of ferromagnetic bulk-likelayers itself. Especially, in these layer systems we were interested inhow the electronic structure is modified (a) by the spin-orbit coupling and (b) by a reduced spatial dimensionality. The electronic structure has been studied by means of angle-resolved andspin-resolved valence-band photoemission spectroscopy. The influence of the spin-orbit coupling has been studied with the linearand the circular magnetic dichroism of valence-band photoemission spectroscopy.The experiments have been supported by analytical and numerical calculations. - At ferromagnetic bulk-like Iron and Nickel layers it is shown how the linear magnetic dichroism is caused by spin-orbit coupling inducedhybridization. On this basis it was possible to derive detail informationabout the spin-orbit coupling in these systems. - The spin-orbit coupling in interface states has been investigated with the circular magnetic dichroism in perpendicular magnetized Palladiumand Copper overlayers on Cobalt substrate layers. The influence of a reduced spatial dimensionality has been studied in Copperoverlayers of a few atomic layers on various ferromagnetic substrate layers.The first think one observes, the electronic states located in these Copperlayers are two-dimensional. Additionally, on homogeneous ferromagnetic substrate layers it is shown how Iron, Cobalt,and Nickel as well as their roughness and thickness determine the behaviorof the two-dimensional electronic states.- With additional layers at the interfaces, i.e. in heterogeneous ferromagneticsubstrates, it is then possible to tailor the behavior of these states