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In this paper, the effect of heat treatment on the structure and magnetic properties of the alloy is investigated by heat treating the melted Fe2Cr1-xMnxGa samples at different temperatures. It is found that the structure and magnetic properties of Fe2Cr1-xMnxGa are very sensitive to heat treatment and there is a certain degree of disorder. The structure of the prepared samples changes with different conditions of heat treatment, and the change in structure will in turn affect the magnetic behavior of the alloy. The magnetization intensity increases with increasing annealing temperature, indicating that the orderliness of the samples is improved by heat treatment. The magnetization intensity of the samples decreases with the doping of Mn content, which is due to the anti-parallel arrangement of the Fe-Mn spin magnetic moments by the doped Mn atoms. [ABSTRACT FROM AUTHOR]

Hexagonal Mn3Ge, with both kagome lattice and triangular antiferromagnetism, has gained significant attention due to its large anomalous Hall effect (AHE), resulting from the non-vanishing Berry phase. In this study, we present the magnetic and anomalous transport properties of a series hexagonal D019 type Fe-doped Mn3Ge alloys with the composition of Mn3.1−xFexGe0.9 (x = 1.6, 1.8, 2.0). The ferromagnetic interactions gradually increase with increasing Fe content. The longitudinal resistivity of all alloys exhibits a typical metallic behavior, increasing with temperature from 5 to 390 K. The residual resistivity decreases from 120.4 to 67.8 μΩ·cm as x increases from 1.6 to 2.0. A temperature-driven Lifshitz transition and a spin reorientation have been observed in the x = 1.6 alloy. Topological Hall effect accompanied by the spin reorientation is demonstrated. The maximum value of the topological Hall resistivity ρ xy T is approximately 0.16 μΩ·cm. The relationship of ρ x y A ∝ ρ x x in x = 1.6 alloy suggests that the extrinsic skew scattering predominantly contributes to the AHE mechanism. In the case of x = 1.8 and 2.0, both intrinsic and extrinsic factors contribute to the AHE. The anomalous Hall conductivity of our polycrystalline samples at room temperature is comparable to that of single crystal Mn3Ge, which is advantageous for practical applications. This study reveals the effectiveness of chemical engineering in tailoring nontrivial spin textures and the AHE. [ABSTRACT FROM AUTHOR]