MAGNETIC K-EDGE ABSORPTION IN 3D ELEMENTS AND ITS RELATION TO LOCAL MAGNETIC-STRUCTURE

Article

关键词: SPIN-DEPENDENT ABSORPTION;    X-RAY ABSORPTION;    ELECTRONIC-STRUCTURE;    L2,3 EDGES;    SCATTERING;    DICHROISM;    L2,3-EDGES;    SPECTRA;    METALS;    IRON;   

DOI  :  10.1103/PhysRevB.47.818

来源: SCIE

【 摘 要 】

In this paper we present a selection of circular magnetic x-ray dichroism (CMXD) measurements at the K edges of Fe, Ni, Co, and Mn in various alloys and compounds. We investigate the correlation between the measured spin-dependent absorption signal and the p-like spin polarization of the unoccupied bands at the Fermi level. In the case of Fe we find a direct correlation of the spin-dependent absorption profile to the p-like spin polarizations. This is discussed for various alloys. The measured CMXD signals are compared with theoretical calculations for the absorption spectra. For Fe and Ni we have performed spin-polarized relativistic Korringa-Kohn-Rostoker Green's function calculations, which give a parameter-free description of the spin-dependent absorption process. The content of information in the experimental CMXD spectra on the local magnetic p and d moments is discussed in comparison with the calculated changes of the p and d moments. In the case of the Co and Ni K edges we find a direct correlation of the average strength of the spin-dependent absorption signal to the p moment. For Co also a direct correlation td the d moment is indicated. At Fe K edges no proportionality of any features of the spin-dependent absorption profile to p or d moments have been found.

【 授权许可】

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