Theoretical study of the X-ray dichroism of 5d-impurity atoms dissolved in ferromagnetic Fe

✍ Scribed by H. Ebert; R. Zeller

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 327 KB
• Volume: 161
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(89)90132-4

✦ Synopsis

Recent measurements

of the X-ray absorption at the L-edges of Sd-impurity atoms dissolved in ferromagnetic Fe resulted in a very pronounced dependence of the corresponding absorption spectra on the helicity of the radiation. Because the physical origin of this X-ray dichroism is the subtle interplay of spin-polarization and spin-orbit coupling, a satisfying description of the phenomenon has to treat spin-magnetism and relativistic effects on the same level. The spin-polarized relativistic Korringa-Kohn-Rostoker-Green's function method of band structure calculation provides a very sound, parameter-free basis for such a description.

We have adopted this approach to calculate the electronic structure and from this the absorption spectra of Sd-impurities dissolved in ferromagnetic Fe. The results of our calculations are in very satisfying agreement with experiment and permit a detailed discussion of the observed spectra and their dependence on the polarization of the X-ray radiation.