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MA: Fachverband Magnetismus

MA 2: Computational Magnetism I

MA 2.12: Vortrag

Montag, 18. März 2024, 12:30–12:45, H 1058

Magnetodynamics in molecular dynamics simulations using the thermal Stoner-Wohlfarth model — •Deniz Mostarac, Andrey Kuznetzov, Pedro A. Sanchez, Dieter Süss, and Sofia Kantorovich — University of Vienna, Vienna, Austria

In this contribution we present a state-of-the-art, hybrid approach, based on an extension of the generalized Stoner-Wohlfarth model to capture thermal activation in magnetic colloids. With this approach we can simulate internal magnetization dynamics of magnetic colloids, including both Brownian and Néel relaxation mechanisms, in large scale, long time scale bulk simulations. The model is qualified against classical systems (solid superparamagnet and a dilute ferrofluid) that are well understood theoretically to demonstrate the range of applicability and the scaleability of the model. Finally, a case study of a suspension of magnetic filaments with superparamagnetic colloids is presented, that highlights that long-range dipolar interactions in quasi-infinite colloidal systems, particularly ones where the translational and rotational degrees of freedom between the colloids are coupled,[1,2] necessitates the use of a sophisticated model incorporating magnetodynamics explicitly and accurately. [1] Mostarac, D., et al. Nanoscale (2020). [2] Mostarac, D., et al. Macromolecules (2022).

Keywords: Magnetic Soft Matter; Magnetodynamics; Stoner-Wohlfarth; Simulation; Magnetic Colloids