  The motion of skyrmions along ferromagnetic strips driven by current pulses
is theoretically analyzed by means of micromagnetic simulations. Analytical
expressions describing the skyrmion dynamics during and after the current pulse
are obtained from an extended rigid skyrmion model, and its predictions are
compared with full micromagnetic simulations for perfect samples with a
remarkable agreement. The dynamics along realistic samples with random disorder
is also studied by both models. Our analysis describes the relevant ingredients
behind the current-driven skyrmion dynamics, and it is expected to be useful to
understand recent and future experimental.
