Download NMAG User Manual (Incomplete DRAFT)

To simulate the magnetised disc, we use the following script (nanodot.py):
import nmag
from nmag import SI, at
#create simulation object
sim = nmag.Simulation()
# define magnetic material
Py = nmag.MagMaterial( name="Py",
Ms=SI(795774,"A/m"),
exchange_coupling=SI(13.0e-12, "J/m")
)
# load mesh: the mesh dimensions are scaled by 100nm
sim.load_mesh( "../nanodot_comparison/nanodot.nmesh.h5",
[("cylinder", Py)],
unit_length=SI(100e-9,"m")
)
# set initial magnetisation
sim.set_m([1.,0.,0.])
Hs = nmag.vector_set( direction=[1.,0.,0.],
norm_list=[12.0, 7.0, [], -200.0],
units=1e3*SI(’A/m’)
)
# loop over the applied fields Hs
sim.hysteresis(Hs,
save=[(’averages’, at(’convergence’)),
(’fields’,
at(’convergence’)),
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