Velocity of motion of domain walls with vortex structure in multilayer ferromagnetic films

A two-dimensional model of the magnetization distribution has been applied to investigating the influence of the layered structure of a ferromagnetic film in which the layers differ in saturation magnetization M _S on the velocity of the motion of domain walls with a vortex distribution of magnetization. Films with uniaxial planar magnetic anisotropy have been analyzed. It is established that, in three-layer films with values of M _S in the near-surface layers that exceed those of the internal layer in a wide range of the external field, the velocity of motion of the domain wall is higher than in a homogeneous film with the same average saturation magnetization.