Dipolar-interaction-induced fractal pattern formation in magnetic multilayers - art. no. 051402

Models concerning particle diffusion and aggregation have been proposed for decades, and the aggregations with long-range dipolar interaction are simu lated and analyzed numerically. In this paper. fractal clusters composed of particles diffusing with dipolar interaction are observed. and a model tak ing both magnetic force and diffusion activation energy into account is pre sented. The computer-simulation results generate clusters similar to those observed. And the measured sizes and dimensions of the experimental results are close to that of simulation. Further investigations on the magnetic en ergy and cluster size reveal that the dipolar interaction and thermal disru ption play significant roles in the aggregation of nanosize magnetic partic les and the interaction energy is the main driving force of the formation o f the ordered structure.