SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Poster Magnetism I
MA 23.45: Poster
Dienstag, 28. März 2023, 17:00–19:00, P1
Calculation of the temperature-dependent exchange stiffness from Domain Wall modelling — •Felix Schug1,2, Nils Neugebauer2,3, Michael Czerner1,2, and Christian Heiliger1,2 — 1Institute for Theoretical Physics, Justus Liebig University Giessen, Heinrich-Buff-Ring 16, 35392 Giessen, Germany — 2Center for Materials Research (LaMa), Justus Liebig University Giessen, Heinrich-Buff-Ring 16, 35392 Giessen, Germany — 3Institute of Experimental Physics I, Justus Liebig University Giessen, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
Understanding the different influences on the macroscopic magnetic properties of a material at finite temperatures is of great interest from a theoretical point of view. As macroscopic magnetic properties, such as anisotropies or the exchange stiffness, are related to the quantum nature of electrons and thus to the most fundamental level of solids, the atomic level, atomistic modelling of magnetic material may promote a more profound understanding of the microscopic processes. Performing the corresponding numerical simulations at various temperatures from 0 K to the Curie-temperature TC, the temperature dependence of the associated macroscopic properties may be modelled. These modelled material parameters can be used to simulate magnetic properties in large-scale temperature-dependent micromagnetic simulations, leading to the so-called multiscale modelling approach. Here the approach of simulating Bloch walls of a finite cobalt stripe at different temperatures is demonstrated to extract the macroscopic crystalline anisotropy constant KC and the exchange stiffness parameter Aexc.