Abstract
High quality L2,3 edges magnetic circular dichroism (MCD) data of in situ grown Fe, Co, and Ni ferromagnetic thin films were measured using transmission x-ray absorption technique. These data were utilized to investigate the validity of the recently proposed x-ray MCD sum-rules that offer a new means for deducing orbital- and spin-magnetic moments from MCD data. We find that the orbital to spin magnetic moment ratios of Fe, Co, and Ni deduced from MCD data according to the sum-rules are at ±30% discrepancy with those deduced from neutron scattering data. This inconsistency may be attributed to the neglecting of multi-electron excitations and band structure effects in the derivation of the sum-rules or due to uncertainties in the neutron scattering results. Caveats for MCD data taken with the fluorescence yield x-ray absorption technique will also be discussed.
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