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MA: Fachverband Magnetismus

MA 10: INNOMAG e.V. Prizes 2026 (Diplom-/Master and Ph.D. Thesis)

MA 10.2: Hauptvortrag

Montag, 9. März 2026, 15:20–15:40, POT/0112

Realistic Modelling of Finite Temperature Electron Transport Properties in Ferromagnets — •Fabian Engelke and Christian Heiliger — Justus Liebig University Giessen, Germany

The quantitative description of the electrical resistivity of a magnetic material remains challenging to this day. While prior publications reached good agreement with experiment in the so-called supercell or direct approach for non-magnetic materials where the spin-disorder contribution to the resistivity is negligible, an accurate, purely theoretical description of magnetic materials remains elusive. This shortcoming can be attributed to the missing accuracy in the description of the temperature-dependent spin-disorder itself. Considering the example of bcc-Fe, we demonstrate that the inclusion of quantum mechanical effects by semiclassical local quantization of the Heisenberg model significantly improves the description of the spin-disorder component to the electrical resistivity. Compared to previous approaches, this model includes the description of magnetic short-range order effects, enabling us to study temperature effects around and above the Curie temperature, where prior mean-field theory-based approaches inevitably predicted a constant contribution. Furthermore, by analyzing the spin-resolved conductivity tensor, we extend our investigation beyond resistivity to determine the spin-flip diffusion length in bcc-iron.

Keywords: Heisenberg Model; Semiclassical Monte Carlo; KKR; Electron Transport