Complex magnetization (strictly speaking complex
spin expectation value) for every spin in the magnetic
cell, represented by a matrix with dimensions of \([3\times
n_{magext}\times n_k]\),
where nMagExt = 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.