SKM 2023 – scientific programme
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SOE: Fachverband Physik sozio-ökonomischer Systeme
SOE 20: Networks: From Topology to Dynamics IV (joint session DY/SOE)
SOE 20.7: Talk
Friday, March 31, 2023, 11:15–11:30, ZEU 250
Controlling the coarsening dynamics of ferrogranular networks by means of a vertical magnetic field — •Oksana Bilous1, Pedro Sánchez1, Matthias Biersack2, Ali Lakkis2, Reinhard Richter2, and Sofia Kantorovich1 — 1Computational and Soft Matter Physics, Faculty of Physics, University of Vienna, 1090 Vienna, Austria — 2University of Bayreuth, Experimental Physics V, 95447 Bayreuth, Germany
In nature, phase transitions of various nature are significant and often lead to abrupt changes in the macroscopic properties of the material. Here, we address the question if a viscoelastic phase separation (VPS), proposed in 2000 by Hajime Tanaka for dynamically asymmetric mixtures, scales up for a shaken mixture of steel and glass spheres, i.e. for a so-called ferrogranulate when an external magnetic field is applied perpendicular to the plane in which the system is confined. In this contribution we focus on computer simulation. We calculated magnetization, dipolar and steric energies, radial distribution functions, the average number of neighbours and the efficiency of the emerging networks as functions of the simulation time and the values of the external vertical magnetic fields. Our results demonstrate that the network formation can be inhibited by the field perpendicular to the sample via dipole-dipole repulsion the field. These results are qualitatively confirmed by the experimental data.