The irreducible part of the Brillouin zone (IBZ) constructed for a non-magnetic crystal phase is commonly used in band-structure calculations. The IBZ changes its shape and volume in a ferromagnetic crystal phase. The author shows how the IBZ constructed for a non-magnetic crystal phase can be utilized for a ferromagnetic crystal phase in band-structure calculations. Applying magnetic space group theory, he justifies the last statement.
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P. Kociński (1993) studied this question.
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