Title: Analysis of the current-driven domain wall motion in a ratchet ferromagnetic strip,
Abstract: The current-driven domain wall motion in a ratchet memory due to spin-orbit
torques is studied from both full micromagnetic simulations and the one
dimensional model. Within the framework of this model, the integration of the
anisotropy energy contribution leads to a new term in the well known q-$\Phi$
equations, being this contribution responsible for driving the domain wall to
an equilibrium position. The comparison between the results drawn by the one
dimensional model and full micromagnetic simulations proves the utility of such
a model in order to predict the current-driven domain wall motion in the
ratchet memory. Additionally, since current pulses are applied, the paper shows
how the proper working of such a device requires the adequate balance of
excitation and relaxation times, being the latter longer than the former.
Finally, the current-driven regime of a ratchet memory is compared to the
field-driven regime described elsewhere, then highlighting the advantages of
this current-driven regime.