Prediction of huge X-ray Faraday rotation at the Gd N_4,5 threshold

Details Prediction of huge X-ray Faraday rotation at the Gd N_4,5 threshold Prediction of huge X-ray Faraday rotation at the Gd N_4,5 threshold

2002-06-10

arxiv.org/abs/cond-mat/0206154v2

Phys. Rev. B 66, 172408 (2002)

Physics

Condensed Matter

Materials Science

4 pages, 2 figures, final version resubmitted to Phys. Rev. B, Brief Reports. Minor changes

Scientific paper

10.1103/PhysRevB.66.172408

X-ray absorption spectra in a wide energy range around the 4d-4f excitation threshold of Gd were recorded by total electron yield from in-plane magnetized Gd metal films. Matching the experimental spectra to tabulated absorption data reveals unprecedented short light absorption lengths down to 3 nm. The associated real parts of the refractive index for circularly polarized light propagating parallel or antiparallel to the Gd magnetization, determined through the Kramers-Kronig transformation, correspond to a magneto-optical Faraday rotation of 0.7 degrees per atomic layer. This finding shall allow the study of magnetic structure and magnetization dynamics of lanthanide elements in nanosize systems and dilute alloys.

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