Abstract
Free energies of sinusoidal and antiferromagnetic spin density waves (SDW) are calculated with the model of energy bands proposed in a previous paper. The calculation for the sinusolidal SDW is made by an interpolation method. It is shown that the commensurate-incommensurate transition (denoted by C-I transition) in Cr-Mn alloys arises from the cooperation of the effect of entropy and the effect of a flow of electrons between the octahedral Fermi surfaces of electron and hole bands and the other free Fermi surfaces. The C-I transition in a helical SDW is also studied. Finally the origin of the C-I transition in Cr-Fe alloys is qualitatively discussed.
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