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X-ray absorption spectra in a wide energy range around the 4d-4f excitationthreshold of Gd were recorded by total electron yield from in-plane magnetizedGd metal films. Matching the experimental spectra to tabulated absorption datareveals unprecedented short light absorption lengths down to 3 nm. Theassociated real parts of the refractive index for circularly polarized lightpropagating parallel or antiparallel to the Gd magnetization, determinedthrough the Kramers-Kronig transformation, correspond to a magneto-opticalFaraday rotation of 0.7 degrees per atomic layer. This finding shall allow thestudy of magnetic structure and magnetization dynamics of lanthanide elementsin nanosize systems and dilute alloys.Comment: 4 pages, 2 figures, final version resubmitted to Phys. Rev. B, Brief  Reports. Minor change

physical review. b, condensed matter

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Prediction of huge x-ray Faraday rotation at the GdN4,5threshold