Regensburg 2019 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 8: Networks: From Topology to Dynamics (joint session DY/SOE)
DY 8.2: Vortrag
Montag, 1. April 2019, 15:15–15:30, H20
Coarsening dynamics of transient ferrogranular networks under influence of a horizontal magnetic field - network alignment and magnetization in experiments and simulations — Justus Miller1, Pedro Sanchez2, Sofia Kantorovich2, 3, and •Reinhard Richter1 — 1Experimentalphysik 5, Universität Bayreuth, Bayreuth, Germany — 2University of Vienna, Vienna, Austria — 3Ural Federal University, Ekaterinburg, Russia
We investigate the phase separation of a shaken mixture of glass and magnetised steel spheres after a sudden quench of the shaker amplitude. Then transient networks of steel spheres emerge in the experiment, as well as in simulations. Analyzing the network evolution by network specific parameters like the mean number of neighbours or network efficiency we have uncovered three regimes (Kögel et al. Soft Matter 14 2018), previously established by H. Tanaka (2000) for the viscoelastic phase separation of dynamically asymmetric mixtures.
Here we present new results for the network evolution under influence of a horizontally applied magnetic field. With increasing field strength the branched networks are more and more replaced by linear chains. We quantitatively characterize the average orientation of the network edges with respect to the direction of the applied field in experiment and simulations and explore the consequences for the magnetization curves.