ATOMIC MAGNETIC-MOMENT AND X-RAY PHOTOELECTRON-SPECTRA OF FE-BASED CRYSTALLINE AND AMORPHOUS-ALLOYS

X-ray photoelectron spectra of the valence band and Fe 2p(3/2) and 3s core levels have been measured both for polycrystalline Fe-Cr alloys a nd amorphous Fe-B alloys. The 3s-multiplet splitting has been used to estimate the local magnetic moment of Fe atoms. To explain the observe d concentration dependence of the magnetic moment, the calculations of the electronic structure and the magnetic moment of the Fe atoms were performed in the framework of the tight-binding coherent potential ap proximation. Results of the calculations agree with the experimental c oncentration dependence of the magnetic moment of Fe atoms, This depen dence of the atomic magnetic moment on a boron concentration for amorp hous Fe-B alloys obeys the Slater-Pauling rule on going from 15.5 to 1 9.5 at.% but shows a slight deviation from this linear behaviour at ab out 15 at.%. For Fe-Cr, alloys the atomic magnetic moment is almost co nstant for differences of components concentration in agreement with X -ray photoemission spectroscopy measurements, whereas the average magn etic moment of the alloy decreases almost linearly with increasing Cr concentration. The difference in concentration dependence of the atomi c magnetic moment is explained in terms of a charge transfer between s , p and d bands which is found to be larger for the amorphous Fe-B all oys than for the polycrystalline Fe-Cr alloys.