Self-organized magnetization in arrays of bistable nanowires

The study of arrays of magnetic nanowires is of large interest for potential technological applications in perpendicular recording media. Magnetostatic interactions between individual nanowires plays an important role in the magnetization process of the array. The objective of this work has been to theoretically analyze the influence of the symmetry of the geometrical array. It is shown that magnetization reversal in an array with cubic symmetry proceeds in a nearly continuous way; meanwhile, a random disposition favors the reversal in a single step. Furthermore, the magnetic interaction of nanowires in the array gives rise to self-organized collective magnetization that can be ascribed to complex systems described by fractals.