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NBANDS inconsistent for magmoms

Posted: Fri Sep 04, 2026 5:51 pm
by matthewkuner

Hello VASP people,

When I submit VASP calcs which are identical EXCEPT for the sign of the magmoms, I get different NBANDS set. Meaning if I set one calc to be ferromagnetic with up-spins [+5, +5], and I set another calc to be ferromagnetic with down-spins [-5, -5], then their NBANDS are set differently. This appears to be a bug where there should be an abs() around the magmoms set.


Re: NBANDS inconsistent for magmoms

Posted: Wed Sep 09, 2026 6:42 pm
by merzuk.kaltak

Dear Matthew,

please share with us the two job files that include INCAR, KPOINTS, POTCAR, POSCAR, stdout and OUTCAR including the job script.
Also, which vasp version do you use. This would help us to pin down what is going on.