Abstract
We investigate electronic transport and magnetization dynamics associated with the current induced spin torque effects in two different classes of magnetic tunnel junctions using Non-Equilibrium Green's Function (NEGF) formalism and Landau-Lifshitz-Gilbert (LLG) equation. We calibrate our transport simulation framework with a diverse set of tri-layer experiments, before we proceed with dual barrier penta-layer MTJ simulations. We investigate and thereby compare the magnetization switching dynamics of a tri-layer with that of an anti-aligned penta-layer MTJ corresponding to parallel (P) to anti-parallel (AP) switching and vice versa. Higher critical switching current density (JC) and asymmetric switching characteristics have been confirmed for tri-layer structures as opposed to the case of identical anti-aligned penta-layer configurations. Energy efficiency of anti-aligned penta-layer over that of tri-layer MTJ structures during spin torque driven magnetization switching has also been reported quantitatively.
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