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DY: Fachverband Dynamik und Statistische Physik

DY 18: Granular Matter / Contact Dynamics

DY 18.12: Vortrag

Mittwoch, 2. April 2014, 12:30–12:45, ZEU 118

Self-Assembly of Spherical Magnets — •Igor Stanković¹, Lara Abou Khali², and René Messina² — ¹Scientifc Computing Laboratory, Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia — ²Institut de Chimie, Physique et Materiaux (ICPM), Universite de Lorraine, 1 Bd. Arago, 57070 Metz, France

The self-assembly of spherical magnets is addressed theoretically. Minimal energy structures are obtained by optimization procedures as well as Monte Carlo computer simulations. Three typical shapes are obtained depending on the number of constitutive magnets N. In the regime of small N, chains are stable as dimers or trimers (i.e., N≤3), then rings become stable for (4≤ N≤ 13) where dipole vectors adopt a vortex-like arrangement. A major finding concerns the stacking of rings as soon as N is large enough (N≤ 14). All the relevant predicted shapes are experimentally reproduced by manipulating commercial magnets.