ORBITAL MOMENTS AND MAGNETIC CIRCULAR-DICHROISM AT THE K EDGE IN 3D TRANSITION-METALS

We calculate the orbital moment and the magnetic circular dichroism (M CD) spectra at the K edge for ferromagnetic Fe, Co and Ni, on the basi s of a tight-binding model including the spin-orbit interaction. We fi nd that both quantities are enhanced by the intra-atomic Coulomb inter action, in good agreement with the experiments. We also find that the MCD spectra are mainly induced by the orbital moment of the 3d states on the neighbor sites through the pd hybridization.