As far as I know magnetic fields are incompatible with periodic boundary conditions and plane-wave DFT. I did find however several implementations based on LAPW where the magnetic field is applied in the muffin tin only - check out the ELK code for example, it is free.
HTH! Chris -- Postdoctoral Researcher Center for Quantum Nanoscience, Institute for Basic Science Ewha Womans University, Seoul, South Korea
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