two domain wall couple

[Shiwei Meng]

I constructed two magnetic domain walls on a nanowire. In one of the domain walls, I excited spin waves. In the other domain wall, due to the dipole-dipole interaction, spin waves would also occur. However, during the practical process, no spin waves appeared in the other domain wall. Here is my mumax3 script. Has anyone encountered a similar problem? Can anyone offer me some help?

setGridSize(1600, 100, 1)

//setCellSize(5e-9, 5e-9, 2e-9)

setCellSize(5e-9, 5e-9, 7e-9)

Msat    = 600e3

Aex     = 10e-12

anisU   = vector(0, 0, 1)

Ku1     = 0.59e6

alpha   = 0.02

//enabledemag = false

defregion(1,yrange(-250e-9,-50e-9))

defregion(2,yrange(-50e-9,-40e-9))

defregion(3,yrange(-40e-9,40e-9))

defregion(4,yrange(40e-9,50e-9))

defregion(5,yrange(50e-9,250e-9))

m.setregion(1,uniform(0,0,1))

m.setregion(2,uniform(1,0,0))

m.setregion(3,uniform(0,0,-1))

m.setregion(4,uniform(1,0,0))

m.setregion(5,uniform(0,0,1))

relax()

alpha  = 0.006

//天线区域

defregion(13,xrange(-4000e-9,-3995e-9).intersect(yrange(40e-9,50e-9)))

//defregion(7,xrange(-3900e-9,-3896e-9).intersect(yrange(-40e-9,-30e-9)))

B_ext.setregion(13, vector(0,0.25*sin( 2*pi*20e9*t),0))

//B_ext.setregion(7, vector(0,0,0.5* sin( 2*pi*15.1e9*t)))

autosave(m,1e-11)

tableAutosave(1e-11)

run(30e-9)