Effects of the dipolar interaction on the equilibrium morphologies of a single supramolecular magnetic filament in bulk

Sanchez, P.A.; Cerdà, Joan J.; Sintes,Tomas; Holm,Christian;
Journal of Chemical Physics 139, 044904 (2013)

We investigate the equilibrium morphologies of a
single supramolecular magnetic filament in a three-dimensional
system as a function of the effective strength of the
magnetic dipolar interactions. The study uses Langevin
dynamics simulations with a bead-spring chain model of freely
rotating dipoles. We demonstrate the existence of three
structural regimes as the value of the dipolar coupling parameter is
increased: a coil compaction regime, a coil expansion regime and a
closed chain regime in which the structures tend progressively to an
ideal ring configuration. We discuss in detail the governing effects
of each regime, the structural transition between open and closed
morphologies, and the reasons why we see no multiloop configurations
that have been observed in two-dimensional systems under similar conditions.


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