Magnetic behavior of B2-type Co1−xFex alloys (x = 0.4 to 0.6) was studied as functions of composition and quenching temperature. Obtained mean magnetic moment showed increase with composition up to x = 0.52 and then changes its slope. Furthermore, the moment decreased with quenching temperature in the B2-phase region, while it remains constant in the A2-phase region. The relation between the observed magnetic moment and the point defect properties was discussed. As a result, the change in the magnetic moment was found to be proportional to the square of the long-range order parameter. This relation was explained by noting the magnetic moment on Fe atom, which was assumed to depend on the number of nearest neighbor Co atoms.

Magnetism and Point Defect in B2-Type CoFe Alloys. M.Kogachi, N.Tadachi, H.Kohata, H.Ishibashi: Intermetallics, 2005, 13[5], 535-42