(spinw-unit)=

# spinw.unit property

Default values are meV, T, Å 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$^2$Å$^3$/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
$[3\times 3]$.