def test_demag_two_spin_xx():
mesh = CuboidMesh(nx=2, ny=1, nz=1)
sim = Sim(mesh)
demag = Demag()
sim.add(demag)
sim.set_m((1, 0, 0))
field = demag.compute_field()
print(field)
assert (field[0] == 2e-7)
assert (field[3] == 2e-7)
def test_demag_two_spin_xx():
mesh = CuboidMesh(nx=2, ny=1, nz=1)
sim = Sim(mesh)
demag = Demag()
sim.add(demag)
sim.set_m((1, 0, 0))
field = demag.compute_field()
print field
assert(field[0] == 2e-7)
assert(field[3] == 2e-7)
def test_demag_fft_exact_oommf():
mesh = CuboidMesh(nx=5, ny=3, nz=2, unit_length=1e-9)
sim = Sim(mesh)
demag = Demag()
sim.add(demag)
def init_m(pos):
x = pos[0]
if x <= 2:
return (1, 0, 0)
elif x >= 4:
return (0, 0, 1)
else:
return (0, 1, 0)
sim.set_m(init_m)
fft = demag.compute_field()
exact = demag.compute_exact()
np.testing.assert_allclose(fft, exact, rtol=1e-10)
def test_demag_fft_exact():
mesh = CuboidMesh(nx=5, ny=3, nz=4)
sim = Sim(mesh)
demag = Demag()
sim.add(demag)
def init_m(pos):
x = pos[0]
if x <= 2:
return (1, 0, 0)
elif x >= 4:
return (0, 0, 1)
else:
return (0, 1, 0)
sim.set_m(init_m)
fft = demag.compute_field()
exact = demag.compute_exact()
# print fft,exact
print np.max(np.abs(fft - exact))
assert np.max(np.abs(fft - exact)) < 5e-22
def test_demag_fft_exact():
mesh = CuboidMesh(nx=5, ny=3, nz=4)
sim = Sim(mesh)
demag = Demag()
sim.add(demag)
def init_m(pos):
x = pos[0]
if x <= 2:
return (1, 0, 0)
elif x >= 4:
return (0, 0, 1)
else:
return (0, 1, 0)
sim.set_m(init_m)
fft = demag.compute_field()
exact = demag.compute_exact()
# print fft,exact
print np.max(np.abs(fft - exact))
assert np.max(np.abs(fft - exact)) < 5e-22
demagfmm = DemagFMM(order, ncrit, theta=theta)
demagfft = Demag()
demagfull = DemagFull()
sim = fidimag.atomistic.Sim(mesh)
sim.set_m((0, 0, 1), normalise=True)
print(f"Bohr Magnetom = {fidimag.common.constant.mu_B}")
sim.set_mu_s(fidimag.common.constant.mu_B)
sim.add(demagfft)
sim.add(demagfmm)
sim.add(demagfull)
start = time.time()
demagfft.compute_field()
end = time.time()
t = end - start
print('fft t = {}'.format(t))
print('{}\n\n'.format(demagfft.field))
start = time.time()
demagfmm.fmm.numcells()
print(f"N * bohr = {fidimag.common.constant.mu_B * N}")
demagfmm.compute_field()
err = (demagfft.field - demagfmm.field) / demagfft.field
errx = (err[0::3] * err[0::3])**0.5
erry = (err[1::3] * err[1::3])**0.5