/*****************************************************************  

  Description: 

   This mumax3 script demonstartes how skyrmions move when spin
   polarized currents exert spin transfer torques on the 
   magnetization.

   This file is written for the mumax3 workshop organised for the 
   spintronic seminar series in the summer of 2020. For more 
   information go to https://www.mumax.ugent.be/mumax3-workshop
  
  Authors:

   Dr. Jonathan Leliaert (jonathan.leliaert@ugent.be)
   Dr. Jeroen Mulkers    (jeroen.mulkers@ugent.be)

******************************************************************/

setgridsize(256,64,1)
setcellsize(1e-9,1e-9,1e-9) 
setpbc(4,0,0)

Msat = 580e3
Aex = 15e-12
Dind = 3.0e-3
Ku1 = 0.8e6
AnisU = vector(0,0,1)
alpha = 0.1

m = neelskyrmion(-1, 1).transl(-40e-9,0,0)
minimize()

Pol = 0.4
xi = 0.2
j = vector(-1e12,0,0) // A/m2

autosave(m,4e-10)
tableAutosave(1e-11)
tableAdd(ext_bubblepos)

run(10e-9)