def main():
from joommf.sim import Sim
from joommf.mesh import Mesh
from joommf.energies.exchange import Exchange
from joommf.energies.demag import Demag
from joommf.energies.zeeman import FixedZeeman
from joommf.drivers import evolver
# Mesh specification.
lx = ly = lz = 50e-9 # x, y, and z dimensions (m)
dx = dy = dz = 5e-9 # x, y, and z cell dimensions (m)
Ms = 8e5 # saturation magnetisation (A/m)
A = 1e-11 # exchange energy constant (J/m)
H = (1e3, 0, 0) # external magnetic field (A/m)
m_init = (0, 0, 1) # initial magnetisation
# Create a mesh.
mesh = Mesh((lx, ly, lz), (dx, dy, dz))
# Create a simulation object.
sim = Sim(mesh, Ms, name='minimisation_example', debug=True)
# Add energies.
sim.add_energy(Exchange(A))
sim.add_energy(Demag())
sim.add_energy(FixedZeeman(H))
sim.set_evolver(evolver.Minimiser(m_init, Ms, name="./test"))
# Set initial magnetisation.
# Run simulation.
sim.minimise()
print("Done")
def main():
from joommf.sim import Sim
from joommf.mesh import Mesh
from joommf.energies.exchange import Exchange
from joommf.energies.demag import Demag
from joommf.energies.zeeman import FixedZeeman
from joommf.drivers import evolver
# Mesh specification.
lx = ly = lz = 50e-9 # x, y, and z dimensions (m)
dx = dy = dz = 5e-9 # x, y, and z cell dimensions (m)
Ms = 8e5 # saturation magnetisation (A/m)
A = 1e-11 # exchange energy constant (J/m)
H = (1e3, 0, 0) # external magnetic field (A/m)
m_init = (0, 0, 1) # initial magnetisation
t_sim = 3e-9 # simulation time (s)
gamma = 2.21e5
alpha = 0.1
# Create a mesh.
mesh = Mesh((lx, ly, lz), (dx, dy, dz))
# Create a simulation object.
sim = Sim(mesh, Ms, name='dynamics_example', debug=True)
# Add energies.
sim.add_energy(Exchange(A))
sim.add_energy(Demag())
sim.add_energy(FixedZeeman(H))
sim.set_evolver(
evolver.LLG(t_sim, m_init, Ms, alpha, gamma, name='./Testing'))
# Set initial magnetisation.
sim.add_output('Magnetization', 100)
# Run simulation.
sim.run()
def test_min_dyn():
import glob
from joommf.sim import Sim
from joommf.mesh import Mesh
from joommf.energies.exchange import Exchange
from joommf.energies.demag import Demag
from joommf.drivers import evolver
from joommf.energies.zeeman import FixedZeeman
# Mesh specification.
lx = ly = lz = 50e-9 # x, y, and z dimensions (m)
dx = dy = dz = 5e-9 # x, y, and z cell dimensions (m)
Ms = 8e5 # saturation magnetisation (A/m)
A = 1e-11 # exchange energy constant (J/m)
H = (1e3, 0, 0) # external magnetic field (A/m)
m_init = (1, 0, 1)
gamma = 2.21e5
alpha = 0.1
# Create a mesh.
mesh = Mesh((lx, ly, lz), (dx, dy, dz))
# Create first simulation object.
sim1 = Sim(mesh, Ms, name='multiple_example_part1', debug=True)
t_sim = 1e-9
sim1.add_energy(Exchange(A))
sim1.add_energy(Demag())
sim1.add_energy(FixedZeeman(H))
sim1.set_evolver(
evolver.Minimiser(m_init, Ms, gamma))
# Set initial magnetisation.
# Run simulation.
sim1.add_output('Magnetization')
sim1.minimise()
m_init2 = glob.glob(sim1.mif_filename[:-4] + "*.omf")[-1]
sim2 = Sim(mesh, Ms, name='multiple_example_part2', debug=True)
sim2.add_energy(Exchange(A))
sim2.add_energy(Demag())
sim2.add_energy(FixedZeeman(H))
sim2.set_evolver(
evolver.LLG(t_sim, m_init2, Ms, alpha, gamma, name='evolver'))
# Set initial magnetisation.
# Run simulation.
sim2.run()
def test_sim_basic_square():
testmesh = mesh.Mesh((10, 20, 30), (3, 3, 3), scale=1e-9)
a = sim.Sim(testmesh, 1e4)
a.add_energy(Demag())
def test_demag_mif():
demag = Demag()
mif_string = demag.get_mif()
assert 'Specify Oxs_Demag {}' in mif_string
assert demag.__repr__() == "This is the energy class of type Demag"
def test_demag_formatting():
demag = Demag()
mif_string = demag.get_mif()
assert mif_string[0] == 'S'
assert mif_string[-1] == '\n'
assert mif_string[-2] == '\n'
def test_demag_formatting():
demag = Demag()
mif_string = demag.get_mif()
assert mif_string[0] == 'S'
assert mif_string[-1] == '\n'
assert mif_string[-2] == '\n'
def test_demag_mif():
demag = Demag()
mif_string = demag.get_mif()
assert 'Specify Oxs_Demag {}' in mif_string
assert demag.__repr__() == "This is the energy class of type Demag"