Lateral diffusion of magnetic colloidal chains confined in thin films and monolayer colloids

Extensive Brownian dynamics simulations are performed on dilute polydisperse magnetic colloidal chains confined in thin films and on a monolayer of polydisperse magnetic colloids. Simulation results show that the magnetic field dependences of the mean-square displacements and the radial distribution functions of the chains are qualitatively similar to those of the monolayer colloids, even if the field dependence of the hexatic bond-orientational order function of the nearest chains is different from that of the monolayer colloids. It is also found that these long-time self-diffusion coefficients collapse on a single master curve recently proposed by Tokuyama.