Antiferromagnetic skyrmion

using MicroMagnetic
using Printf

@using_gpu()

mesh = CubicMesh(; nx=800, ny=800, nz=1, dx=0.418e-9, dy=0.418e-9, dz=0.418e-9, pbc="xy")

function m0_fun(i, j, k, dx, dy, dz)
    flag = (i + j) % 2 == 0 ? 1 : -1
    r2 = (i - 300)^2 + (j - 300)^2
    if r2 < 10^2
        return (0.1 * flag, 0, -1 * flag)
    end
    return (0.1, 0, 1 * flag)
end

function relax_system()
    sim = Sim(mesh; driver="LLG")
    sim.driver.alpha = 0.5

    set_mu_s(sim, 2.96 * mu_B)

    add_exch(sim, -34.4 * meV)
    add_dmi(sim, 1.09 * meV)
    add_anis(sim, 0.053 * meV; axis=(0, 0, 1))
    #add_demag(sim)

    init_m0(sim, m0_fun)

    #using LLG to relax the system for the first 500 steps
    relax(sim; max_steps=500, stopping_dmdt=1e-4)

    #change driver to SD since SD is much faster than LLG
    set_driver(sim; driver="SD")
    sim.driver.max_tau = 1
    relax(sim; max_steps=50000, stopping_dmdt=1e-4)

    return save_vtk(sim, "afm_skx")
end

relax_system (generic function with 1 method)

relax_system()

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