Anyway, when you have a structure which has only a "few" (2-4)
nonequivalent Fe positions, then it makes sense to play with magnetic
order and compare total energies.
You would start in different directories and BEFORE init_lapw run
instgen_lapw -ask and specify the desired magnetic order by chosing up
or dn for each Fe site (and nm for Ga).
Slide 26 at the link below for another material YBaFe2O5 might be a good
complementary example for this type of thing:
http://www.cms.tuwien.ac.at/media/uploads/cms/psi-presentations/Blaha.ppt
and corresponding article:
http://publik.tuwien.ac.at/files/PubDat_174458.pdf
For visualisation you may create a struct file where you rename your
atoms to Co, Ni,...., so that you can distinguish them in xcrysden and
then you can see how to arrange the magnetic moments to get them in a
specific order.
Good to know, but one might also try VESTA. In VESTA, you should be
able to turn on atom labels individually without having to rename them
in the struct file. Also, you can hide the Ga atoms, if you just want
to see the Fe atoms.
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