COMPUTER-SIMULATION OF THE ORIENTATION DYNAMICS OF A 2D ARRAY OF FINEMAGNETIC PARTICLES IN AN OPPOSED-POLES ORIENTATION MAGNET

The orientation dynamics of a 2D assemblage of interacting acicular pa rticles in an opposed-poles arrangement has been modelled, and is aime d at establishing general principles which will be investigated furthe r by a 3D molecular dynamics model. The equations of motion of the sys tem are represented by a set of three first-order ODEs, where a net to rque expression and the infinitely-damped form of the Landau-Lifschitz equation are used to model the particle and moment dynamics, respecti vely. The resinous vehicle is treated (to a first approximation) as a homogeneous, isotropic Newtonian fluid. This initial study shows the i mportance of pre-orientation due to mechanical shear during coating.