Effects of Substituted Elements on Spin Reorientation in Mn_2−xFe_xSb_1−ySn_y

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The spin reorientation and Curie temperature of Mn_2−xFe_xSb_1−ySn_y (0 ≤ x, y ≤ 0.15) compound were investigated by magnetization measurements. Spin reorientation temperature increased from 255 K at x = 0 to 383 K at x = 0.15, whereas it almost unchanged by Sn substitution. Curie temperature decreased down to 518 K with both Fe and Sn substitution. Substitution of Fe stabilized the ferrimagnetic state with magnetic moment lying in c-plane. Substitution of Sn induced the antiferromagnetic phase at low temperature. It was found that the magnetic hysteresis derived from quasi first-order magnetic phase transition exhibited at x ≥ 0.10 or T ≥ 300 K.

Fig. 5 Magnetic phase diagrams for Mn_2−xFe_xSb_1−ySn_y in function of x (a) and y (b). Open symbols indicate the composition which exhibited QFOMT.