(spinw-unit-cell)=

# spinw.unit_cell property

## 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, non-magnetic atoms have `S=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 x-ray
  stored in a $[2\times n_{atom}]$ matrix, first row is neutron,
  second row is for x-ray.
 
`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 x-ray
  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 Å$^2$.
  Definition is the same as in
  [FullProf](https://www.ill.eu/sites/fullprof/), defining the
  Debye-Waller factor as $W(d) = 1/8*b_{iso}/d^2$ which is
  included in the structure factor as $\exp(-2W(d))$.