Modeling of spin-torque driven magnetization dynamics in a spin-valve with combined in-plane and out-of-plane polarizers

Abstract

Spin-torque (ST) driven magnetization dynamics have been investigated in a spin-valve structure that consists of an in-plane (IP) free layer and two fixed polarizers [magnetized IP and out-of-plane (OP)]. Three distinct dynamics including no switching, switching, and periodic oscillation are identified in a phase diagram governed by the ST parameters. The ST strengths which are able to switch the free layer have been analytically predicted and supported by simulations, showing that the torque originated from the OP polarizer should be much smaller than that from the IP polarizer. The free layer driven by the dual polarizers could switch 10 times faster than that by a single IP polarizer.