Evolution of diverse Hall effects due to successive magnetic transitions has been observed in Mn2.5Fe0.6Sn0.9 by suitable chemical substitution of Fe in Mn3.1Sn0.9. This noncollinear antiferromagnetic alloy exhibits a Neel temperature of 325 K. Upon cooling from 325 K, a magnetic phase transition from noncollinear antiferromagnetism to ferromagnetism occurs at 168 K due to the tilting of magnetization towards c axis. Above this temperature, anomalous Hall resistivity ranged from 0.6 to 1.3 μΩ cm has been observed in noncollinear antiferromagnetic state. Below this temperature, a topological Hall effect (THE) starts to appear due to the non-vanishing scalar spin chirality arising from the noncoplanar spin structure. Further decreasing temperature to 132 K, another magnetic transition happens, resulting in the coexistence of ferromagnetism and antiferromagnetism, so that a Hall plateau with large hysteresis below 70 K is yielded. A hysteresis as high as ∼80 kOe is obtained in ρ
xy
-H at 15 K. However, the Hall plateau disappears and only anomalous Hall effect (AHE) persists when further decreasing the temperature to 5 K. The present study provides a picture of diverse magneto-transport properties correlated to the variable spin structures driven by magnetic phase transitions.
In this paper, noncollinear antiferromagnets Mn3.1Sn0.9 and Mn2.5Cr0.6Sn0.9 with an Ni3Sn-type hexagonal structure has been synthesized. An exchange bias (EB) from 5 K to room temperature has been observed in Mn2.5Cr0.6Sn0.9 with a maximum EB field of 3166 Oe at 5 K, which decreases gradually to 60 Oe at 300 K. It is proposed that the EB is ascribed to the exchange anisotropy between the ferromagnetic component and the antiferromagnetic host due to the magnetic inhomogeneity of the materials. Large anomalous Hall effect ranging from 3.5 to 1 µΩ · cm persists from 5 K to 300 K, which is attributed to the non-vanishing Berry phase arising from the non-collinear spin structure. Both the exchange bias and anomalous Hall effect in a wide temperature range of 5–300 K suggest that the Mn–Cr–Sn alloy has a promising application prospect in antiferromagnetic based spintronics devices.
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