simulates the switch of a spin-torque MRAM

[jmiasif]

Hi ubermag team @fangohr @marijanbeg @swapneelap
Description:
This mumax3 scripts simulates the switch of a spin-torque MRAM
stack consisting of a fixed layer, spacer and free layer, using
the Slonczewski model.

// geometry
sizeX := 160e-9
sizeY := 80e-9
sizeZ := 5e-9

Nx := 64
Ny := 32
 
setgridsize(Nx, Ny, 1)
setcellsize(sizeX/Nx, sizeY/Ny, sizeZ)
setGeom(ellipse(sizeX, sizeY))

// set up free layer
Msat  = 800e3
Aex   = 13e-12
alpha = 0.01
m     = uniform(1, 0, 0)

// set up fixed layer polarization
angle := 20
px := cos(angle * pi/180)
py := sin(angle * pi/180)
fixedlayer = vector(-px, -py, 0)

// set up fixed and spacer layer parameters
lambda       = 1
Pol          = 0.5669
epsilonprime = 0

// send current
Jtot := 0.008            // total current in A
area := sizeX*sizeY*pi/4
jc   := Jtot / area       // current density in A/m2
J = vector(0, 0, jc)

// schedule output & run
autosave(m, 100e-12)
tableautosave(10e-12)
run(1e-9)

when we increase ms =1.3e6 kA/mand jc=2E11 A in mumax its not simulated while i wait for more than hour but not simulated why?
besically i want to find magnetisation in z direction and want to calculate switching time from 1 to -1.
can we run this mumax code in ubermag please help.