Nonlinear dynamics of vortexlike domain walls in magnetic films with in-plane anisotropy - art. no. 104412

The nonlinear nonstationary dynamics of domain walls with variable two-dime nsional internal structure (topological solitons with internal degrees of f reedom) under the action of an external magnetic field was investigated in magnetic films having an in-plane anisotropy and a small damping coefficien t alpha. The iteration calculation procedure of the temporal evolution of t he magnetization distribution is based on the predictor-corrector method fo r direct numerical solution to the Landau-Lifshitz equations. The variable time step procedure was employed. It is shown that along with the periodic change of the internal structure of a wall occurring with a certain period T there also appear the subperiodic vibrations of some parts of the walls r elative to the other parts which results in the high-frequency oscillations (similar or equal to 10(11) Hz) of the velocity of a domain wall in the fi elds above some critical field H-c at a small damping. The dependence of th e period of dynamic rearrangement of the internal structure of the walls on the external magnetic field and damping was studied. The singular dependen ce of T on H is established to be different from the (H-2/H-c(2)-1)(-1/2) l aw which is typical of one-dimensional models of a wall. The dependence of H-c on zeta is evaluated and appears to differ substantially from that of t he one-dimensional models.