Spin-density waves and domain wall interactions in nanowires.

We investigated how the dynamics of a domain wall are affected by the presence of spin-density waves in a ferromagnetic wire. Domain walls and other scattering centers can cause coherent spin-density waves to propagate through a wire when a current is applied. In some cases, the spin torque due to these scattered electrons can be enhanced such that it is on a par with the exchange and anisotropy energies controlling the shape and dynamics of the domain wall. In such a case, we find that the spin-density waves enhance the current-induced domain-wall motion, allowing for domain-wall motion with smaller current pulses. Here, we consider a system involving two domain walls and focus on how the motion of the second domain wall is modified by the spin-density waves caused by the presence of the first domain wall. [ABSTRACT FROM AUTHOR]