Help: System dynamics with STT

[Ponsudana]

Hello, Good day,

I am new to JOOMMF, need help with initializing system dynamics with STT.

From the example problems, the system dynamics is given as,

system.dynamics += oc.Precession(gamma) + oc.Damping(alpha) + oc.STT(u=(ux, 0, 0), beta=beta)

Does this imply the dynamics in the free layer of a spin valve nanopillar, when the spin-polarized electrons are directed along +x direction? (Ref. Image1)

If so, how can I initialize the dynamics for a dual barrier MTJ with two pinned layer (Pentalayer)? (Ref. Image2)

Thank you,

Regards,

Ponsudana