84 research outputs found
Spin-transfer torque in disordered weak ferromagnets
We study theoretically the spin transfer effect on a domain wall in
disordered weak ferromagnets. We have identified the adiabatic condition for
the disordered case as \lambda \gg \lambda_{\rm D}\equiv \sqrt{{\hbar
D}/{\spol}}, where and \spol are the diffusion constant and the spin
splitting energy due to the - type exchange interaction, respectively,
and found out that perfect spin-transfer effect occurs even in weak
ferromagnets as long as this condition is satisfied. The effective term
arising 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
- …