MAGNETIC LINEAR DICHROISM IN SPIN-RESOLVED FE 2P PHOTOEMISSION

Linear magnetic dichroism is studied for the Fe 2p level by angle- and spin-resolved photoemission with high energy resolution. The dichrois m occurs in angle-resolved experiments for a geometry as in the transv erse magneto-optic Kerr effect, i.e., on reversal of sample magnetizat ion in the direction normal to the plane defined by light polarization and electron emission. The large spin-orbit splitting allows us to in vestigate the j=1/2 and j=3/2 states separately. Spin analysis allows differentiation between polarization effects related to exchange and s pin-orbit interactions. The results are discussed in the framework of an atomic model, where the exchange interaction between the magnetic d shell and the core hole lifts the degeneracy of magnetic sublevels of the core hole spectrum. The model is able to explain the general tren d in the spectra, but does not fully account for the observed shapes o f the j=3/2 peaks. The analysis shows that the dichroism is governed b y the spin polarization parameter which determines the spin-orbit-indu ced spin polarization. This shows that if there is a magnetic dichrois m then there is a finite spin-orbit-induced spin polarization. The ric h structures observed in our complete experiment are evidence for the influence of many-electron effects in the Fe 2p spectrum.