Current-induced domain wall motion in nanostrip–nanobars system

Transverse domain wall motion in strips with a series of nanobars placed perpendicularly on either side has been investigated systematically by micromagnetic simulation. Domain wall motion in strips is driven by electric current owing to the spin transfer torque effect. In a strip in contact with nanobars, a domain wall can withstand a high current density (above A/cm2) to maintain structural stability, but the domain wall velocity cannot be increased markedly. Domain wall motion in strips not in contact with nanobars can reach a higher speed under a relatively low current density. To examine the effects of nanobars on domain wall motion, the DW depinning energy and the Walker limit uw at different parameters are discussed systematically.