Abstract
Large spin-dependent absorption effects have been observed with circularly polarized photons of energies between 10.8 keV and 13.8 keV at theL 2,3-edges of Os, Ir, Pt, and Au impurities (3 at.%) in iron. The largest value of the spin-dependent absorption coefficient (µ c /µ o ∼+0.22) is found at the PtL 2-edge. From the energy dependence of the spin-dependent absorption at theL 2- andL 3-edges the spin-density profiles of thed 3/2-andd 5/2-projected states populated in the absorption process are derived. Thed 5/2-spin densities deduced from theL 3 spin-dependent absorption spectra agree well with spin-polarized band-structure calculations for the ferromagnetic ground state. A comparison of thed 3/2- andd 5/2-spin densities shows a strong contribution of the spin-orbit effects to the exchange splitting in Os, whereas only small spin-orbit effects are indicated for Ir, Pt and Au impurities.
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