With the experimental results obtained with a special nanopillar structure and the calculations based on the one-dimensional diffusion equations, the respective contributions to the spin torque from spin accumulation and local spin current are quantitatively deduced. The results for a typical nanopillar structure show that the spin accumulation contributes to about 90% of the necessary torque for the antiparallel to parallel switching, while the parallel to antiparallel switching is totally dominated by the local spin current. Both the variations in spin accumulation and local spin current should be considered in any effort to reduce the critical switching current density. However it seems more effective to increase the local spin current in most cases.
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 2006|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics