SURFACE MAGNETIC-PROPERTIES OF OXYGEN ON FERROMAGNETIC-FILMS - A SPIN-RESOLVED MDS STUDY

Using spin polarized metastable deexcitation spectroscopy (SPMDS) we d etermine spin asymmetries for remanently magnetized iron(110) and coba lt(0001) films clean and oxygen covered. For clean surfaces a dominanc e of minority spins is observed at the Fermi edge. At the Fermi edge o xygen exposure leads to a reversal of the dominance of the spin for ir on, but not for cobalt, being in agreement with theoretical calculatio ns. An oxygen induced structure at a kinetic energy of 5.5 eV shows a dominance of minority spins, but with different dependence on coverage for iron and cobalt.