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We investigate field-driven domain wall (DW) propagation in magneticnanowires in the framework of the Landau-Lifshitz-Gilbert equation. We proposea new strategy to speed up the DW motion in a uniaxial magnetic nanowire byusing an optimal space-dependent field pulse synchronized with the DWpropagation. Depending on the damping parameter, the DW velocity can beincreased by about two orders of magnitude compared the standard case of astatic uniform field. Moreover, under the optimal field pulse, the change intotal magnetic energy in the nanowire is proportional to the DW velocity,implying that rapid energy release is essential for fast DW propagation.

Fast domain wall propagation under an optimal field pulse in magnetic nanowires