Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 62: Disodered Magnetic Materials
MA 62.6: Talk
Friday, March 20, 2020, 10:45–11:00, HSZ 401
Impact of correlation effects on the magneto-optical Kerr effect in transition metals and their alloys — •Andreas Held1, Ján Minár2, and Hubert Ebert1 — 1Department Chemie, Ludwig-Maximilians-Universität München — 2New Technologies-Research Center, University of West Bohemia, Pilsen
The magneto-optical Kerr effect (MOKE) is a well-established tool for investigating the properties of magnetic systems. Originating from the subtle interplay between magnetic order and spin-orbit coupling, a proper theoretical description of MOKE requires an appropriate framework. Such a scheme has been worked out by Huhne [1] on the basis of the fully relativistic spin-polarized Korringa-Kohn-Rostoker method [2]. To allow for the treatment of substitutionally disordered systems, the approach has been combined with the coherent potential approximation (CPA) alloy theory. The extended scheme gives access to the configurationally averaged optical conductivity tensor and this way to the corresponding complex Kerr angle. The additional combination with Dynamical Mean Field Theory (DMFT) [3] allows in particular to investigate the influence of correlation effects on the MOKE in disordered systems. Corresponding results for pure Ni, Fe and Co as well as disordered FexCo1−x and CoxPt1−x alloys are presented and compared with experimental data.
[1] Huhne, Ebert, Phys. Rev. B 60, 12982 (1999); Huhne, Ebert, Phys. Stat. Sol. B 215, 839 (1999)
[2] Ebert, Ködderitzsch, Minár, Rep. Prog. Phys. 74, 096501 (2011)
[3] Minár et al., Phys. Rev. B 72, 045125 (2005)