Growth process of clusters formed by paramagnetic microparticles in an ac/dc combined magnetic field

Patterns formed by nano/microparticles in colloidal systems are of great interest and importance from both scientific technological points view. Magnetic colloids particularly interesting since the structures magnetic particles can be quite easily controlled external fields. In this study, we investigate growth process clusters paramagnetic microparticles a fluctuating field composed direct current applied vertical direction an alternating one horizontal direction. We find that thin walls, thickness which is equal to diameter particle, particles; length walls increases via wall-edge-to-wall-edge coagulation, but they do not grow laterally due repulsive forces acting between lateral Finally, scaling features walls. law applies during certain period process.