def example2(Ms):
x0 = y0 = z0 = 0
x1 = 500
y1 = 10
z1 = 100
nx = 50
ny = 1
nz = 1
mesh = df.Box(x0, y0, z0, x1, y1, z1, nx, ny, nz)
S1 = df.FunctionSpace(mesh, "Lagrange", 1)
S3 = df.VectorFunctionSpace(mesh, "Lagrange", 1, dim=3)
llb = LLB(S1, S3)
llb.alpha = 0.01
llb.beta = 0.0
llb.M0 = Ms
llb.set_M((Ms, 0, 0))
llb.set_up_solver(jacobian=False)
llb.chi = 1e-4
H_app = Zeeman((0, 0, 5e5))
H_app.setup(S3, llb._M, Ms=1)
llb.interactions.append(H_app)
exchange = Exchange(13.0e-12, 1e-2)
exchange.chi = 1e-4
exchange.setup(S3, llb._M, Ms, unit_length=1e-9)
llb.interactions.append(exchange)
demag = Demag("FK")
demag.setup(S3, llb._M, Ms=1)
llb.interactions.append(demag)
max_time = 1 * np.pi / (llb.gamma * 1e5)
ts = np.linspace(0, max_time, num=100)
for t in ts:
print t
llb.run_until(t)
df.plot(llb._M)
df.interactive()
def example1(Ms=8.6e5):
x0 = y0 = z0 = 0
x1 = y1 = z1 = 10
nx = ny = nz = 1
mesh = df.Box(x0, x1, y0, y1, z0, z1, nx, ny, nz)
S1 = df.FunctionSpace(mesh, "Lagrange", 1)
S3 = df.VectorFunctionSpace(mesh, "Lagrange", 1, dim=3)
vis = df.Function(S3)
llb = LLB(S1, S3)
llb.alpha = 0.01
llb.beta = 0.0
llb.M0 = Ms
llb.set_M((Ms, 0, 0))
llb.set_up_solver(jacobian=False)
llb.chi = 1e-4
H_app = Zeeman((0, 0, 1e5))
H_app.setup(S3, llb._M, Ms=1)
llb.interactions.append(H_app)
exchange = Exchange(13.0e-12, 1e-2)
exchange.chi = 1e-4
exchange.setup(S3, llb._M, Ms, unit_length=1e-9)
llb.interactions.append(exchange)
max_time = 2 * np.pi / (llb.gamma * 1e5)
ts = np.linspace(0, max_time, num=100)
mlist = []
Ms_average = []
for t in ts:
llb.run_until(t)
mlist.append(llb.M)
vis.vector()[:] = mlist[-1]
Ms_average.append(llb.M_average)
df.plot(vis)
time.sleep(0.00)
print 'llb times', llb.call_field_times
save_plot(ts, Ms_average, 'Ms_%g-time.png' % Ms)
df.interactive()