import joommfutil.typesystem as ts
from .energyterm import EnergyTerm
@ts.typesystem(name=ts.Name(const=True))
class Demag(EnergyTerm):
_latex = (r'$-\frac{1}{2}\mu_{0}M_\text{s}'
r'\mathbf{m} \cdot \mathbf{H}_\text{d}$')
def __init__(self, name='demag'):
"""Abstract demagnetisation energy class."""
self.name = name
@property
def _repr(self):
"""A representation string property.
Returns:
A representation string.
"""
return 'Demag(name=\'{}\')'.format(self.name)
import joommfutil.typesystem as ts
from .dynamicsterm import DynamicsTerm
@ts.typesystem(alpha=ts.Scalar(unsigned=True), name=ts.Name(const=True))
class Damping(DynamicsTerm):
_latex = (r'$\alpha \mathbf{m} \times'
r'\frac{\partial \mathbf{m}}{\partial t}$')
def __init__(self, alpha, name='damping'):
"""A damping dynamics term class.
Args:
alpha (Real): Gilbert damping
"""
self.alpha = alpha
self.name = name
@property
def _repr(self):
"""A representation string property.
Returns:
A representation string.
"""
return 'Damping(alpha={}, name=\'{}\')'.format(self.alpha, self.name)
import joommfutil.typesystem as ts
from .dynamicsterm import DynamicsTerm
@ts.typesystem(u=ts.Vector(size=3), beta=ts.Scalar, name=ts.Name(const=True))
class STT(DynamicsTerm):
_latex = (r'$-(\mathbf{u} \cdot \boldsymbol\nabla)\mathbf{m} + '
r'\beta\mathbf{m} \times \big[(\mathbf{u} \cdot '
r'\boldsymbol\nabla)\mathbf{m}\big]$')
def __init__(self, u, beta, name='stt'):
"""A spin transfer torque term.
Args:
u (RealVector): velocity vector
beta (Real): non-adiabatic parameter
"""
self.u = u
self.beta = beta
self.name = name
@property
def _repr(self):
"""A representation string property.
Returns:
A representation string.
"""
return ('STT(u={}, beta={}, '
import pyvtk
import struct
import numpy as np
import joommfutil.typesystem as ts
import discretisedfield as df
import discretisedfield.util as dfu
import matplotlib.pyplot as plt
from mpl_toolkits.axes_grid1 import make_axes_locatable
@ts.typesystem(mesh=ts.Typed(expected_type=df.Mesh),
dim=ts.Scalar(expected_type=int, unsigned=True, const=True),
name=ts.Name(const=True))
class Field(dfu.Field):
"""Finite difference field
This class defines a finite difference field and provides some
basic operations. The field is defined on a finite difference mesh
(`discretisedfield.Mesh`).
Parameters
----------
mesh : discretisedfield.Mesh
Finite difference rectangular mesh on which the field is defined.
dim : int, optional
Dimension of the field value. For instance, if ``dim=3``
the field is three-dimensional vector field; and for
``dim=1`` it is a scalar field.
value : 0, array_like, callable, optional
For more details, please refer to the `value` property.
norm : numbers.Real, callable, optional
import joommfutil.typesystem as ts
from .energyterm import EnergyTerm
@ts.typesystem(H=ts.Vector(size=3), name=ts.Name(const=True))
class Zeeman(EnergyTerm):
_latex = r'$-\mu_{0}M_\text{s} \mathbf{m} \cdot \mathbf{H}$'
def __init__(self, H, name='zeeman'):
"""A Zeeman energy class.
This method internally calls set_H method. Refer to its documentation.
"""
self.H = H
self.name = name
@property
def _repr(self):
"""A representation string property.
Returns:
A representation string.
"""
return 'Zeeman(H={}, name=\'{}\')'.format(self.H, self.name)