def mesh_from_state(state, mesh_file_name):
state["hl"] = 0.5*state["nanopillar_length"]
state["hsy"] = 0.5*state["nanopillar_side_y"]
state["hsz"] = 0.5*state["nanopillar_side_z"]
geo = """
algebraic3d
solid nanopillar = orthobrick (-$hl$, -$hsy$, -$hsz$; $hl$, $hsy$, $hsz$)
-maxh=$discretization$;
tlo nanopillar;
"""
from nsim.netgen import NetgenMesh
nm = NetgenMesh()
nm.set_vars(state)
nm.geo(geo)
nm.save(mesh_file_name)
def mesh_from_state(state, mesh_file_name):
state["hl"] = 0.5 * state["nanopillar_length"]
geo = """
algebraic3d
solid nanopillar = cylinder (-$hl$, 0, 0; $hl$, 0, 0; $nanopillar_radius$)
and plane (-$hl$, 0, 0; -1, 0, 0)
and plane ( $hl$, 0, 0; 1, 0, 0)
-maxh=$discretization$;
tlo nanopillar;
"""
from nsim.netgen import NetgenMesh
nm = NetgenMesh()
nm.set_vars(state)
nm.geo(geo)
nm.save(mesh_file_name)
mn = mesh_name(geom)
if not os.path.exists(os.path.join(mesh_directory, mn)):
required_meshes[geom] = mn
if len(required_meshes) != 0:
print "Some meshes need to be created..."
from nsim.netgen import NetgenMesh
os.chdir(mesh_directory)
for geom in required_meshes:
mesh_name = required_meshes[geom]
sl, hl, hc, r = geom
w = 2*sl + 2*hl + hc
x2 = 0.5*w
x1 = x2 - hl
x0 = x1 - sl
nm = NetgenMesh()
nm.set_vars({'x0': x0, 'x1':x1, 'x2':x2, 'r':r, 'maxh':discretization})
nm.geo("""
algebraic3d
solid hc = cylinder (-$x0$, 0, 0; $x0$, 0, 0; $r$)
and plane (-$x0$, 0, 0; -1, 0, 0)
and plane ( $x0$, 0, 0; 1, 0, 0) -maxh=$maxh$;
solid hl = cylinder (-$x1$, 0, 0; -$x2$, 0, 0; $r$)
and plane (-$x2$, 0, 0; -1, 0, 0)
and plane (-$x1$, 0, 0; 1, 0, 0) -maxh=$maxh$;
solid hr = cylinder ($x1$, 0, 0; $x2$, 0, 0; $r$)
and plane ($x1$, 0, 0; -1, 0, 0)
and plane ($x2$, 0, 0; 1, 0, 0) -maxh=$maxh$;
disturb_duration = 1*ps
# Name of the file which will contain the relaxed magnetisation
m0_filename = 'm0.h5'
######
relaxed = os.path.exists(m0_filename)
if not os.path.exists(mesh_filename):
relaxed = False
vars = {'bar_length': bar_length,
'bar_crossec1': bar_crossec1,
'bar_crossec2': bar_crossec2,
'discretisation': discretisation}
m = NetgenMesh()
m.set_vars(vars)
m.geo("""
algebraic3d
solid bar = orthobrick (0, 0, 0; $bar_length$, $bar_crossec1$, $bar_crossec2$)
-maxh = $discretisation$;
tlo bar;
""")
m.save(mesh_filename)
permalloy = nmag.MagMaterial('Py',
Ms=SI(0.86e6, 'A/m'),
exchange_coupling=SI(13e-12, 'J/m'),
llg_damping=[0.5, 0.02][relaxed])