Stability of information stored in nanoscopic arrays of ferromagnetic posts

The damage spreading technique is applied to discuss the stability of the magnetic structure of nanoscopic arrays of monodomain ferromagnetic posts. Simulations are performed with the Pardavi-Horvath algorithm. The stability is considered on a plane (σ, Ha), where σ is the dispersion of the coercive field of the posts, and Ha is the amplitude of an applied, slowly varying sinusoidal magnetic field. The phase diagrams on stability are obtained for square lattices and triangular lattices. In both cases, areas are found where the stability is lost.