Ig. Batirev et al., ATOMIC MAGNETIC-MOMENT AND X-RAY PHOTOELECTRON-SPECTRA OF FE-BASED CRYSTALLINE AND AMORPHOUS-ALLOYS, Journal of non-crystalline solids, 197(2-3), 1996, pp. 205-209
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.