In our last paper published in Phys. Rev. E, we experimentally explored the behavior of a monolayer of millimetric beads interacting through short range magnetic dipole-dipole interactions. As the system is athermal, a mechanical agitation is used to produce an erratic motion of the beads. The two-dimensional melting scenario predicted by the Kosterlitz-Thouless-Halperin-Nelson-Young theory is observed. Each phase (liquid-hexatic-solid) has been highlighted with the use of both static and dynamic order parameters.
J.Schockmel, E.Mersch, N.Vandewalle and G.Lumay, Melting of a confined monolayer of magnetized beads, Phys. Rev. E 87, 062201 (2013) – PDF