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MA: Fachverband Magnetismus
MA 42: Posters Magnetism I
MA 42.52: Poster
Mittwoch, 18. März 2020, 15:00–18:00, P3
Induced moment mediated exchange couplings in transition metal systems — •Laszlo Udvardi1,2 and Laszlo Szunyogh1,2 — 1Department of Theoretical Physics, Budapest University of Technology and Economics, Budafoki ut 8, H-1111 Budapest, Hungary — 2MTA-BME Condensed Matter Research Group, Budapest University of Technology and Economics, Budafoki ut 8, H-1111 Budapest, Hungary
For a reliable description of the temperature dependent magnetic properties of transition metal alloys containing non-magnetic elements or thin magnetic films on non-magnetic substrates the exchange couplings mediated by the non-magnetic atoms must be included. In particular, in order to reproduce the proper gap due to the magnetic anisotropy in the magnetic excitation spectra of thin films, the effect of the induced moments on the substrate atoms must be taken into account. However, the direct inclusion of the exchange interaction between the magnetic and non-magnetic atoms introduces artificial dispersion-less bands in the magnon spectrum. In the present work a new procedure is developed to renormalize the exchange couplings between the magnetic atoms within the framework of the Korringa-Kohn-Rostoker Green-function method. The method is demonstrated for the temperature dependent magnetic anisotropy of ordered FePt alloy and for the magnon spectra of Fe layers on different non-magnetic substrates.