On the breakdown of stationary motion of a domain wall in bilayer uniaxial magnetic films with different signs of the gyromagnetic ratio in layers

The motion of an isolated domain wall in bilayer uniaxial magnetic films with a gyromagnetic ratio of different sign in the layers is studied by numerically solving the Slonczewski equations. The gyromagnetic ratio and the thickness of the layers are varied, and threshold values of the field and velocity of the domain wall at which a breakdown of its stationary motion takes place are calculated. It is shown that, for a specific relationship between the thickness and the gyromagnetic ratio of the layers, the field and the velocity for the breakdown of the stationary motion of the domain wall increase infinitely.