calculates magnetic structure factor using FFT
sFact = STRUCTFACT(obj, Option1, Value1, ...)
Input:
obj Input sw object, contains positions of the magnetic atoms,
nExt parameter and the direction of the magnetic spins.
Options:
fExt Number of reciprocal lattice cells, to calculate form
factor, dimensions are [1 3].
Default value is [1 1 1].
S Optional magnetic structure to use instead of the one stored
in obj.
Output:
'sFact' is a structure with the following fields:
F2 Square of the 3 dimensional magnetic structure factor,
dimensions are:
[nExt(1)*fExt(1) nExt(2)*fExt(2) nExt(3)*fExt(3)],
where nExt is the size of the extended unit cell.
perp Square of the perpendicular component of the magnetic structure
factor to the Q scattering vector, same size as sFact.int.
xyz Cell storing the components of the complex structure factor in
the form {X, Y, Z}.
hkl Cell storing the wavevectors (h, k, l) in reciprocal lattice
units, in the form {h, k, l} where the dimensions of each
vector are [1 nExt(ii)*fExt(ii)] where ii is {1, 2, 3} for
{h, k, l}.
obj Copy of the input obj object.
See also SW_PLOTSF, SW_INTSF, SW.ANNEAL, SW.GENMAGSTR.