Magnetic Properties and Magnetic Phase Diagram of bcc Cr–Fe–Mn Alloys

Magnetization measurements have been performed on bcc Cr 80- x Fe 20 Mn x (3.6≤ x ≤38.4) and Cr 75- x Fe 25 Mn x (5.0≤ x ≤29.1) alloys between 6 and 300 K using a SQUID magnetometer. The ferromagnetic and spin-glass transitions are observed in these alloys. The magnetic phase diagram of bcc Cr 80- x Fe 20 Mn x and Cr 75- x Fe 25 Mn x alloys are determined using the Curie temperature, T C and spin-glass temperature, T g decided in this work, and the Neel temperatures, T N reported on the same alloy system. The spin-glass phase spreads for a wide concentration region in the present Cr–Fe–Mn ternary alloy system. The magnetic moment of the ferromagnetic Cr–Fe–Mn alloys at T =0 is compared with Slater-Pauling curve.