Antiferromagnetism and Weak Ferromagnetism of Disordered bcc Cr–Mn Alloys

Magnetic and electrical properties of concentrated Cr 1- x Mn x alloy (0≤ x ≤0.6) with the bcc structure were investigated. The magnetic property shows a band antiferromagnetism (0< x ≤0.10) and an additive localized paramagnetism ( x >0.1). An analysis of the electrical resistivity gives a truncation factor of the Fermi surface as a function of x . By these results, the localized state of spins of Mn atoms and the concentration dependence of antiferromagnetic energy gap are elucidated. Weak ferromagnetism appears in the range of 0< x <0.17 with the Curie point of 45 K and the maximum moment of 0.0029 µ B per atom, and occurrence conditions of the weak ferromagnetism are shown.