JLeliaert
commented
6 years ago You will have to initialize the magnetization with a domain wall, as it will not spontaneously nucleate at these "low" current densities. to this end, you can use
m=twodomain(-1,0,0,0,1,0,1,0,0)
Next, your nanowire is only 200 nm long, which will make it practically impossible to study any motion. Either you will need to make the wire longer, or make use of a moving simulation window (please have a look at the Py racetrack example on http://mumax.github.io/examples.html)
Finally, I would remove the autosave(m.{x,y,z}()) because this information is contained in the autosave(m, 200e-12) statement and can be extracted in post-processing. Also, the correct syntax would have been autosave(m.comp({0,1,2}), 200e-12)
Best wishes, Jonathan Leliaert
On Wed, Aug 29, 2018 at 6:02 AM, researchAM notifications@github.com wrote:
I am trying to simulate domain wall motion from one end of a conventional nanowire to another (Ref: Sbiaa, R., and M. Al Bahri. "Constricted nanowire with stabilized magnetic domain wall." Journal of Magnetism and Magnetic Materials 411 (2016): 113-115, Fig. 1(a), 2, 3). But I fail to do so. The parameters are- saturation magnetization = 600e03 A/m^3 magnetic anisotropy energy = 5e04 J/m^3 exchange stiffness = 1.3e-11 J/m current density = 8.65e11 A/m^2 spin polarization of the applied current = 0.6 damping constant = 0.014 initial magnetization = m_{x} =-1 Current is flowing along positive x-direction
`Nx := 128 Ny := 32 Nz := 1 sizeX := 200e-9 sizeY := 40e-9 sizeZ := 3e-9 SetGridSize(Nx, Ny, Nz) SetCellSize(sizeX/Nx, sizeY/Ny, sizeZ/Nz)
edgesmooth = 8 // Smoothing edge regions to reduce the staircase effect
save(regions)
Msat = 600e03 Ku1 = 5e04 Aex = 1.3e-11 alpha = 0.014
m = uniform(-1,0,0) relax() saveas(m,"xyz")
J = vector(8.65e11, 0, 0) Pol = 0.6
autosave(m, 200e-12) autosave(m.x(), 200e-12) autosave(m.y(), 200e-12) autosave(m.z(), 200e-12) tableautosave(10e-12)
run(10e-09)`
I do not know if it is the right platform for my query, but I will be really thankful if you could help in this matter.
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Liciou
I am trying to simulate domain wall motion from one end of a conventional nanowire to another (Ref: Sbiaa, R., and M. Al Bahri. "Constricted nanowire with stabilized magnetic domain wall." Journal of Magnetism and Magnetic Materials 411 (2016): 113-115, Fig. 1(a), 2, 3). But I fail to do so. The parameters are- saturation magnetization = 600e03 A/m^3 magnetic anisotropy energy = 5e04 J/m^3 exchange stiffness = 1.3e-11 J/m current density = 8.65e11 A/m^2 spin polarization of the applied current = 0.6 damping constant = 0.014 initial magnetization = m_{x} =-1 Current is flowing along positive x-direction
`Nx := 128 Ny := 32 Nz := 1 sizeX := 200e-9 sizeY := 40e-9 sizeZ := 3e-9 SetGridSize(Nx, Ny, Nz) SetCellSize(sizeX/Nx, sizeY/Ny, sizeZ/Nz)
edgesmooth = 8 // Smoothing edge regions to reduce the staircase effect
save(regions)
Msat = 600e03 Ku1 = 5e04 Aex = 1.3e-11 alpha = 0.014
m = uniform(-1,0,0) relax() saveas(m,"xyz")
J = vector(8.65e11, 0, 0) Pol = 0.6
autosave(m, 200e-12) autosave(m.x(), 200e-12) autosave(m.y(), 200e-12) autosave(m.z(), 200e-12) tableautosave(10e-12)
run(10e-09)`
I do not know if it is the right platform for my query, but I will be really thankful if you could help in this matter.