arXiv

​Spin Hall effect versus Rashba torque: a diffusive approach

​Spin Hall effect versus Rashba torque: a diffusive approach
A. Manchon 
2012/4/22
 arXiv preprint arXiv:1204.4869​​​
A. Manchon
.
arXiv
​Current-driven magnetization dynamics of single ferromagnets in heavy metal/ferromagnet bilayers has been recently realized. In this work, spin torque induced by so-called Rashba spin-orbit coupling and spin Hall effect are considered within a diffusive model. The dependence of the resulting torque as a function of the thicknesses of the ferromagnet and heavy metal is analyzed. We show that: 
T||m × y + Tm × (y × m),
(ii) the ratio T||/T strongly depends on the thickness of the layers and
(iii) the thickness dependence of the spin torque provides an indication of the origin of the (Rashba- or spin Hall effect-induced) spin torque .