Spin-transfer effects in MgO-based tunnel junctions with an out-of-plane free layer and an in-plane polarizer: Static states and steady-state precession

This paper aims to explore potential mechanisms for sustaining steady-state precession in MgO-based magnetic tunnel junctions (MTJ) with an in-plane polarizer and an out-of-plane free layer. The Landau-Lifshitz-Gilbert-Slonczewski equation is analytically and numerically solved for a nano-pillar MTJ with circular cross-section under constant perpendicular applied current and field. It is demonstrated that the spin torque angular asymmetry is sufficient to sustain the spin transfer torque-driven dynamics of spin-torque nano-oscillators.