SPIN-RESOLVED AND HIGH-ENERGY-RESOLUTION XPS STUDIES OF COBALT METAL AND A COBALT MAGNETIC GLASS

The role of electron spin in photoelectric emission from the 2s, 2p(1/ 2), 2p(3/2), and 3p core levels of cobalt metal is investigated throug h a combination of spin-resolved x-ray-photoelectron spectroscopy (SRX PS) and high-energy-resolution XPS (HRXPS) studies. The sensitivity of the Co core-level spectra to a variation in the valence spin polariza tion is revealed by comparing the Co-metal data with SRXPS and HRXPS s pectra from the amorphous cobalt-based ferromagnetic glass Co66Fe4Ni1B 14Si15 The results demonstrate explicitly the role of intra-atomic exc hange in deep-core-level photoemission from Co, and reveal core-hole s pin dependencies to core-hole-induced electron-hole-pair excitation, t o the L(1)L(2,3) V Coster-Kronig transition rate, and to the rates of Auger transitions involving the valence band. The data also suggest th at the reduction of the cobalt magnetic moment in the Co66Fe4Ni1B14Si1 5 glass results from the transfer of majority-spin 3d electron density into the minority-spin 3d band caused by a hybridization-induced weak ening of the 3d electron-electron interaction.