Molecular dynamics simulations were carried out to find the underlying stru
ctures of a Magnetorheological (MR) fluid while taking into account dipolar
forces, viscous drag, and the Brownian force. Three different structures w
ere found: the bet lattice, chains, and a liquid state. The conditions unde
r which these structures are found is based on two parameters A and B which
are the ratios of the dipolar force to the viscous drag force and the Brow
nian force to the dipolar force respectively.