} """) mag.set_local_magnetic_coupling(mat_Dy, mat_Fe, -80.0) mag.defregion("DyFe2", nm.box([1.0], [2.0]), mag_mat=[mat_Dy, mat_Fe]) mag.defregion( "YFe2", nm.union([nm.box([0.0], [1.0]), nm.box([2.0], [3.0])]), mag_mat=mat_Fe # can pass either a material or a list of materials ) mag.set_meshing_parameters( cache_name="exchange-spring-mesh", bounding_box=([-1.0], [5.0]), a0=0.25, max_steps=100, ) mag.create_mesh() def initial_m(dof_name, coords): print "DDD initial_M(dof_name=\"", dof_name, "\",coords=", coords, ")\n" dir = dof_name[1][0] if dir == 0: return 0.0 elif dir == 1: return math.cos(2.0 * math.pi * coords[0] / 6.0) else: return math.sin(2.0 * math.pi * coords[0] / 6.0)
) mag.set_local_magnetic_coupling(mat_Dy,mat_Fe,-80.0) mag.defregion("DyFe2",nm.box([1.0],[2.0]), mag_mat=[mat_Dy,mat_Fe] ) mag.defregion("YFe2", nm.union([nm.box([0.0],[1.0]),nm.box([2.0],[3.0])]), mag_mat=mat_Fe # can pass either a material or a list of materials ) mag.set_meshing_parameters(cache_name="exchange-spring-mesh", bounding_box=([-1.0],[5.0]), a0=0.25, max_steps=100, ) mag.create_mesh() def initial_m(dof_name,coords): print "DDD initial_M(dof_name=\"",dof_name,"\",coords=",coords,")\n" dir=dof_name[1][0] if dir==0: return 0.0 elif dir==1: return math.cos(2.0*math.pi*coords[0]/6.0) else: return math.sin(2.0*math.pi*coords[0]/6.0)
mag.set_intensive_parameters([]) # mag.set_default_order(1) # default anyway... mag.set_features({"demag":True,"exchange":True,"timestep":True}) # XXX change usage! mat_Py = mag.MagMaterial("Py",Ms=1.0,A=13.0, # A = exchange constant ) mag.defregion("Py", nm.ellipsoid([3.0,3.0,3.0]), mag_mat=mat_Py) mag.set_meshing_parameters(cache_name="exchange-spring-mesh", bounding_box=([-4.0,-4.0,-4.0],[4.0,4.0,4.0]), a0=1.0, max_steps=600, ) mag.create_mesh() mag.set_magnetization([0.0,0.0,1.0]) # providing a vector rather than a function import nfem.visual nfem.visual.fields2vtkfile([mag.default_simulation_context.field_M],'sphere-initial.vtk',mesh=mag.default_simulation_context.mesh) mag.advance_time_cvode(0.02) nfem.visual.fields2vtkfile([mag.default_simulation_context.field_M],'sphere-final.vtk',mesh=mag.default_simulation_context.mesh)
"Ball 2", nm.ellipsoid([2.0, 2.0, 2.0], transform=[("shift", [3.0, 0.0, 0.0])])) # Note: clearly, we DO need a better way to specify geometries. Ideally, I would like to be # able to write instead: # # mag.defregion("Ball 1",nm.shifted([-3,0,0],nm.sphere(3))) # mag.defregion("Ball 2",nm.shifted([ 3,0,0],nm.sphere(3))) # # or alternatively: # # sphere = nm.sphere(3) # mag.defregion("Ball 1",nm.shifted([-3,0,0],sphere)) # mag.defregion("Ball 2",nm.shifted([ 3,0,0],sphere)) mag.set_meshing_parameters(cache_name="two-balls") mag.create_mesh() def initial_M(dof_name, coords): dir = dof_name[1][0] if dir == 0: return math.cos(coords[0]) elif dir == 1: return math.sin(coords[0]) else: return 0 mag.set_magnetization([1.0, 0.0, 0.0]) # may also provide a function here!
mag.defregion("Ball 2",nm.ellipsoid([2.0,2.0,2.0],transform=[("shift",[3.0,0.0,0.0])])) # Note: clearly, we DO need a better way to specify geometries. Ideally, I would like to be # able to write instead: # # mag.defregion("Ball 1",nm.shifted([-3,0,0],nm.sphere(3))) # mag.defregion("Ball 2",nm.shifted([ 3,0,0],nm.sphere(3))) # # or alternatively: # # sphere = nm.sphere(3) # mag.defregion("Ball 1",nm.shifted([-3,0,0],sphere)) # mag.defregion("Ball 2",nm.shifted([ 3,0,0],sphere)) mag.set_meshing_parameters(cache_name="two-balls") mag.create_mesh() def initial_M(dof_name,coords): dir=dof_name[1][0] if dir==0: return math.cos(coords[0]) elif dir==1: return math.sin(coords[0]) else: return 0 mag.set_magnetization([1.0,0.0,0.0]) # may also provide a function here! #mag.set_magnetization(initial_M) # may also provide a function here!