# Spin-transfer torque in disordered weak ferromagnets - Condensed Matter > Mesoscale and Nanoscale Physics

Abstract: We study theoretically the spin transfer effect on a domain wall indisordered weak ferromagnets. We have identified the adiabatic condition forthe disordered case as $\lambda \gg \lambda { m D}\equiv \sqrt{{\hbarD}-{\spol}}$, where $D$ and $\spol$ are the diffusion constant and the spinsplitting energy due to the $s$-$d$ type exchange interaction, respectively,and found out that perfect spin-transfer effect occurs even in weakferromagnets as long as this condition is satisfied. The effective $\beta$ termarising from the force turns out to govern the wall dynamics, and therefore,the wall motion can be as efficient as in strong ferromagnets even if $\spol$is small.

Author: Yoshisuke Ban, Gen Tatara

Source: https://arxiv.org/