Patterns in magnetic granular media at the crossover from two to three dimensions

E. Opsomer1, S. Merminod2, J. Schockmel1, N. Vandewalle1, M. Berhanu3 and E. Falcon3

1Université de Liège, GRASP, CESAM, B-4000 Liège, Belgium
2Brandeis University, Martin A. Fisher School of Physics, Waltham, MA 02453, USA
3
Université de Paris, Université Paris Diderot, MSC, UMR7057 CNRS, F-75 013 Paris, France

Reference: Physical Review E 102, 042907  (2020)    

URL: https://journals.aps.org/pre/abstract/10.1103/PhysRevE.102.042907
DOI:  https://doi.org/10.1103/PhysRevE.102.042907

Abstract:
We perform three-dimensional particle-based simulations of confined, vibrated, and magnetizable beads to study the effect of cell geometry on pattern selection. For quasi-two-dimensional systems, we reproduce previously observed macroscopic patterns such as hexagonal crystals and labyrinthine structures. For systems at the crossover from two to three dimensions, labyrinthine branches shorten and are replaced by triplets of beads forming upright triangles which self-organize into a herringbone pattern. This transition is associated with increases in both translational and orientational orders.

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