Nonlinear dynamics for magnetic systems with a single-spin potential with variable shapes

Results of computer simulations to investigate the spin dynamics of a classical ferromagnet subject to easy-plane anisotropy and a parameterized Zeeman energy are reported. The variability of the Zeeman term induces a deformable substrate potential in the system. The results show substantial deviations between the conventional sine-Gordon and deformable sine-Gordon description. Solitary-like solutions, shock waves, nanopteron waves and a variety of phenomena, including large easy-plane deviations are also observed. The results display ballistic, diffusive as well as stochastic behaviors. The region of parameters and limits of applicability of deformability effects induced by parameterization of the Zeeman energy are examined. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005