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AM: Magnetismus

AM 1: Spektroskopie I & II

AM 1.2: Talk

Monday, March 26, 2001, 10:15–10:30, S 5.2

X-Ray Faraday Effect at the L_2,3-Edges of Fe, Co, and Ni:
Theory and Experiment — •Peter Oppeneer¹, Jan Kunes¹, Hans-Christoph Mertins², Franz Schäfers², Andreas Kaupp², and Wolfgang Gudat² — ¹IFW-Dresden — ²BESSY, Berlin

The X-ray Faraday effect (XFE) at the L_2,3 edges of the 3d ferromagnets Fe, Co, and Ni is studied both theoretically and experimentally. We perform ab initio calculations of the XFE on the basis of the local spin-density approximation. Experimental X-ray Faraday rotation and ellipticity spectra are measured with linearly polarized soft-X-ray synchrotron radiation at BESSY, Berlin. >From the measured XFE we determine the intrinsic dichroic contributions to the dispersive, absorptive part of the refractive index, and compare these to ab initio calculated counterparts. The theoretical dichroic spectra are in very good quantitative agreement with the experimental data. The inclusion of the spin polarization of the core states leads to a small, yet non-negligible, improvement of the theoretical dichroic spectra. Our results illustrate that the many-particle X-ray excitation spectrum can sufficiently be approximated by the Kohn-Sham single-particle spectrum.