[Pw_forum] AFM calculation

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Dear all,

I have some questions about the AFM calculations. In the examples QE gave, they use NiO with one plane of Ni spin up, with the other spin down. However, in my case, I calculate the slab model, and I just chose two atoms on the surface spin up and another two atoms on the surface spin down while there are still some atoms in the second and third layer in the up spin. So, I am not sure if this kind of random specification is reasonable or meaningful. Or, should we specify the up spin and down spin in different plane? Thank you in advance.

Best regards,

Yuanqing Wang