Spin torques estimation and magnetization dynamics in dual barrier resonant tunneling penta-layer magnetic tunnel junctions

This paper discusses electronic transport and magnetization dynamics associated with current induced spin-torque effects in dual barrier magnetic tunnel junctions using Non-Equilibrium Green´s Function formalism and Landau-Lifshitz-Gilbert (LLG) equation. In a dual barrier penta-layer MTJ, a set of geometry and band-structure parameters including the free-layer thickness, oxide barrier height, width of the tunneling barrier and applied voltage jointly determines the position of resonant peaks and valleys within the energy range of interest. The combined effect of these design parameters to enhance the in-plane and out-of-plane spin-torque efficiencies in both aligned and anti-aligned penta-layer MTJs has been studied in this paper.