The spinw object properties store all the information necessary for the spin wave calculation. It has 8 fields with several subfields, see below.
lattice
stores the unit cell parameters
Sub fields

lat_const
: Lattice constants in a $[1\times 3]$ vector in units defined in [spinw.unit] (default value is \ang). 
angle
:[\\alpha,\\beta,\\gamma]
angles in a $[1\times 3]$ vector in radian units. 
sym
: Symmetry operators stored in matrix with dimensions of $[3\times 4 \times n_{op}]$. 
origin
: Origin of the cell in lattice units. 
label
: Label of the space group.
unit_cell
Stores the atoms in the crystallographic unit cell
Sub fields

r
: Positions of the atoms in the unit cell, stored in a matrix with dimensions of $[3\times n_{atom}]$, values are in lattice units. 
S
: Spin quantum number of the atoms, stored in a row vector with $n_{atom}$ number of elements, nonmagnetic atoms haveS=0
. 
label
: Label of the atom, strings stored in a $[1\times n_{atom}]$ cell. 
color
: Color of the atom stored in a matrix with dimensions of $[3\times n_{atom}]$, where every column defines an RGB color with values between 0 and 255. 
ox
: Oxidation number of the atom, stored in a $[1\times n_{atom}]$ matrix. 
occ
: Site occupancy in a $[1\times n_{atom}]$ matrix. 
b
: Scattering length of the atoms for neutron and xray stored in a $[2\times n_{atom}]$ matrix, first row is neutron, second row is for xray. 
ff
: Form factor of the site stored in a $[2\times 9\times n_{atom}]$ matrix, first row is the magnetic form factor for neutrons, the second row is the charge form factor for xray cross section. 
Z
: Atomic number in a row vector. 
A
: Atomic mass (N+Z) for isotopes and 1 for natural distribution of isotopes stored in a row vector. 
biso
: Isotropic displacement factors in units of \ang$^2$. Definition is the same as in FullProf, defining the DebyeWaller factor as $W(d) = 1/8*b_{iso}/d^2$ which is included in the structure factor as $\exp(2W(d))$.
twin
stores the crystal twin parameters
Sub fields

rotc
: Rotation matrices in the $xyz$ coordinate system for every twin, stored in a matrix with dimensions of $[3\times 3\times n_{twin}]$. 
vol
: Volume ratio of the different twins, stored in a row vector with $n_{twin}$ elements.
matrix
stores 3x3 matrices for using them in the Hamiltonian
Sub fields

mat
: Stores the actual values of 3x3 matrices, in a matrix with dimensions of $[3\times 3\times n_{matrix}]$, if assigned for a bond, the unit of energy is stored in [spinw.unit] (default value is meV). 
color
: Color assigned for every matrix, stored in a matrix with dimensions of $[3\times n_{matrix}]$, with each column defining an RGB value. 
label
: Label for every matrix, stored as string in a cell with dimensions of $[1\times n_{matrix}]$.
single_ion
stores single ion terms of the Hamiltonian
Sub fields
aniso
: Row vector that contains $n_{magatom}$ integers, each integer assignes one of the matrices from the [spinw.matrix] property to a magnetic atom in the generated [spinw.matom] list as a single ion anisotropy. Zero value ofaniso
means no single ion anisotropy for the corresponding magnetic atom.
g
: Row vector with $n_{magatom}$ integers, each integer assignes one of the matrices from the [spinw.matrix] property to a magnetic atom in the spinw.matom list as a gtensor. Zero value ofg
means a default gvalue of 2 for the corresponding atoms. 
field
: External magnetic field stored in a row vector with 3 elements, unit is defined in [spinw.unit] (default unit is Tesla). T
: Temperature, scalar, unit is defined in [spinw.unit] (default unit is Kelvin).
coupling
stores the list of bonds
Sub fields

dl
: Distance between the unit cells of two interacting spins, stored in a $[3\times n_{coupling}]$ matrix. 
atom1
: First magnetic atom, pointing to the list of magnetic atoms in the list generated byspinw.matom
, stored in a row vector with $n_{coupling}$ element. 
atom2
: Second magnetic atom, same asatom1
. 
mat_idx
: Stores pointers to matrices for every coupling in a $[3\times n_{coupling}]$ matrix, maximum three matrix per coupling (zeros for no coupling) is allowed. 
idx
: Neighbor index, increasing indices for the equivalent couplings, starting with 1,2,… which means first and second neighbor bonds, respectively. 
type
: Type of coupling corresponding tomat_idx
matrices. Default is 0 for quadratic exchange,type = 1
for biquadratic exchange. 
sym
: Iftrue
the bond symmetry operators will be applied on the assigned matrix. 
rdip
: Maximum distance until the dipolar interaction is calculated. Zero value means no dipolar interactions are considered. 
nsym
: The largest bondidx
value that is generated using the space group operators. Typically very long bonds for dipolar interactions won’t be calculated using space group symmetry.
mag_str
stores the magnetic structure
Sub fields

F
: Complex magnetization (strictly speaking complex spin expectation value) for every spin in the magnetic cell, represented by a matrix with dimensions of $[3\times n_{magext}\times n_k]$, wherenMagExt = nMagAtom*prod(N_ext)
and $n_k$ is the number of the magnetic propagation vectors. 
k
: Magnetic propagation vectors stored in a matrix with dimensions of $[3\times n_k]$. 
N_ext
: Size of the magnetic supercell in lattice units, default value is[1 1 1]
emaning that the magnetic cell is identical to the crystallographic cell. The $[1\times 3]$ vector extends the cell along the $a$, $b$ and $c$ axes.
unit
stores the physical units for the Hamiltonian
Default values are meV, T, $\unicode{x212B}$ and K for energy, magnetic field, length and temperature, respectively.
Sub fields

kB
: Boltzmann constant, default value is 0.0862 meV/K. 
muB
: Bohr magneton, default values is 0.0579 meV/T. 
mu0
: Vacuum permeability, default value is 201.335431 T$^2\unicode{x212B}^3$/meV. 
label
: Labels for distance, energy, magnetic field and temperature stored in a cell with dimensions $[1\times 4]$. 
nformula
: Number of formula units in the unit cell. 
qmat
: Transformation matrix that converts the given $Q$ values into the internal reciprocal lattice. The matrix has dimensions of $[3\times 3]$.
cache
stores temporary values
This property should be only used to check consistency of the code.
Sub fields

matom
: Generated data of the magnetic unit cell. 
symop
: Generated symmetry operators for each bond.