Regarding Domain wall Racetrack

[Rajesh Kumar Roul]

Dear All, 

I hope you all are doing well. I am simulating TDW in nanowire having two symmetrical square shapes notched at the middle of the wire. When i am applying current density(j) both notch and TDW are moving.To get DW velocity I want the DW position at each point of the nanowire .But here both Notch and DW are moving. Please help me where i am doing wrong.

setGridSize(500, 50, 6)
setCellSize(3e-9, 3e-9, 2e-9)

Msat    = 800e3
Aex     = 13e-12
Xi      = 0.01
alpha   = 0.05
m       = twodomain(1,0,0,  0,1,0,  -1,0,0).transl(-650e-9, 0, 0 )
snapshot(m)

notches := rect(50e-9, 50e-9).Repeat(0, 50*3e-9, 0).Transl(0, 25*3e-9, 0)
setGeom(notches.inverse())
snapshot(geom)

// Remove surface charges from left (mx=1) and right (mx=-1) sides to mimic infinitely long wire. We have to specify the region (0) at the boundaries.
BoundaryRegion := 0
MagLeft        := 1
MagRight       := -1
ext_rmSurfaceCharge(BoundaryRegion, MagLeft, MagRight)

relax()
ext_centerWall(0) // keep m[0] (m_x) close to zero

// Schedule output
autoSnapshot(m, 50e-12)
tableadd(ext_dwpos)   // domain wall position
table autosave(10e-12)

// Run the simulation with current through the sample
pol = 0.56
J   = vector(-10e12, 0, 0)
Run(10e-9)

[Nasir Mehmood]

Hello Rajesh!

ext_centerWall(0) actually centers the simulation window on the domain wall, that is why your whole track (along with the notches) appears moving.

Have a look on PMA Racetrack example

http://mumax.github.io/examples.html#example10

Regards

Nasir

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Dr. Nasir Mehmood
Post Doc Researcher

Lanzhou University, GS, PRC