Thanks Mr Victor for your reply I have learned from the literature that spin-orbit coupling is involved in the spin orientation .
Even for a ferromagnetic or a antiferromagnetic state , the spins have different orientations. How can we determine the orientation of the spins according to the use of the spin-orbit coupling ? Best regards -- Mr: A.Reggad Laboratoire de Génie Physique Université Ibn Khaldoun - Tiaret Algerie
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