Pedro A. Sánchez, Joan J. Cerdà, Tomás Sintes, Christian Holm
We present a study on the equilibrium morphologies of a single supramolecular magnetic filament in a three-dimensional system and their dependence on the effective strength of the magnetic dipolar interactions. The study is based on Langevin dynamics simulations with a bead-spring chain model of freely rotating dipoles. Our results show the existence of three structural regimes as the value of the dipolar couping parameter is increased: a coil compaction regime, a coil stretching regime and a closed chain regime in which the structures tend progressively to an ideal ring configuration. We also found an indication of the existence of a further regime of closed structures that only can be observed for long enough chains. We discuss in detail the effects governing each regime and the structural transition between open and closed morphologies, as well as the absence of the multiloop configurations found under similar conditions in two-dimensional systems.
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http://arxiv.org/abs/1302.5845
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