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DY: Fachverband Dynamik und Statistische Physik

DY 41: Poster: Nonlinear Dynamics, Granular Matter, and Machine Learning

DY 41.2: Poster

Mittwoch, 11. März 2026, 15:00–18:00, P5

Diffusion in a Ferrogranular Pinball Machine — Ali Lakkis¹, Matthias Biersack¹, Oksana Bilous², Sofia Kantorovich², and •Richter Reinhard¹ — ¹Experimentalphysik 5, Universität Bayreuth — ²Fakultät für Physik, Universität Wien

We experimentally investigate the diffusion of millimeter-sized glass and steel beads in a vessel under vertical vibration. At high amplitudes of an applied vertically oriented magnetic induction B, the magnetization of the steel beads aligns with the field direction. This causes the magnetized steel spheres to become nearly pinned in a hexagonal lattice due to dipole-dipole repulsion. As a result, they act as obstacles that hinder the diffusion of the glass beads, similar to the pins in a pinball machine. When B is reduced, the hexatic lattice of steel spheres becomes more fluid-like. We track both the glass and steel beads and estimate their mean square displacement (MSD) for different values of B. These results are compared to Molecular Dynamics simulations of a quasi-2D thermalized Stockmayer-glass mixture [1].

[1] O. Bilous, K. A. Okrugin, A. Lakkis, R. Richter, S. S. Kantorovich, Self-diffusion in Ferrogranulates: Stockmayer Model Revisited, J. Moll. Liquids, submitted (2025)

Keywords: diffussion; ferrogranulate; mean square displacement; magnetic granular matter