Dynamical rearrangement of domain walls with vortex internal structure in magnetic uniaxial films with in-plane anisotropy.

New mechanisms of dynamic rearrangement of internal vortex structure of moving domain walls (topological solitons with internal degrees of freedom) in magnetic uniaxial film with an easy axis in its plane are revealed. A nonlinear dependence of the bifurcation field, above which a wall motion become nonstationary, is found on the film thickness, the magnetization saturation, and the anisotropy field.