Current-induced switching of magnetic tunnel junctions: Effects of field-like spin-transfer torque, pinned-layer magnetization orientation and temperature

摘要

We study current-induced switching in magnetic tunnel junctions (MTJs) in thepresence of a field-like spin-transfer torque and titled pinned-layermagnetization in the high current limit at finite temperature. We consider boththe Slonczewski and field-like torques with coefficients $a_J$ and $b_J $,respectively. At finite temperatures, $\sigma= b_J/a_J = \pm1$ leads to asmaller mean switching time compared that with $\sigma = 0$. The reduction ofswitching time in the presence of the field-like term is due to the alignmenteffect (for $\sigma > 0$) and the initial torque effect.