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首页> 外文期刊>Journal of Experimental and Theoretical Physics >Determination of the Normal and Anomalous Hall Effect Coefficients in Ferromagnetic Ni_(50)Mn_(35)In_(15 - x)Si_x Heusler Alloys at the Martensitic Transformation
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Determination of the Normal and Anomalous Hall Effect Coefficients in Ferromagnetic Ni_(50)Mn_(35)In_(15 - x)Si_x Heusler Alloys at the Martensitic Transformation

机译：马氏体相变中铁磁Ni_（50）Mn_（35）In_（15-x）Si_x Heusler合金的正常和反常霍尔效应系数的确定

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摘要

The magnetization, the electrical resistivity, the magnetoresistance, and the Hall resistivity of Ni_(50)Mn_(35)In_(15 - x)Si_x (x = 1.0, 3.0, 4.0) Heusler alloys are studied at T = 80-320 K. The martensitic transformation in these alloys occurs at T = 220-280 K from the high-temperature ferromagnetic austenite phase into the low-temperature martensite phase having a substantially lower magnetization. A method is proposed to determine the normal and anomalous Hall effect coefficients in the presence of magnetoresistance and a possible magnetization dependence of these coefficients. The resistivity of the alloys increases jumpwise during the martensitic transformation, reaches 150-200 μΩ cm, and is almost temperature-independent. The normal Hall effect coefficient is negative, is higher than that of nickel by an order of magnitude at T = 80 K, decreases monotonically with increasing temperature, approaches zero in austenite, and does not undergo sharp changes in the vicinity of the martensitic transformation. At x = 3, a normal Hall effect nonlinear in magnetization is detected in the immediate vicinity of the martensitic transformation. The temperature dependences of the anomalous Hall effect coefficient in both martensite and austenite and, especially, in the vicinity of the martensitic transformation cannot be described in terms of the skew scattering, the side jump, and the Karplus-Lutinger mechanisms from the anomalous Hall effect theory. The possible causes of this behavior of the magnetotransport properties in Heusler alloys are discussed.
机译：Ni_（50）Mn_（35）In_（15-x）Si_x（x = 1.0，3.0，4.0）Heusler合金在T = 80-320 K时的磁化强度，磁阻，磁阻和霍尔电阻率这些合金中的马氏体相变在T ＝ 220-280K时发生，从高温铁磁奥氏体相转变成磁化强度显着降低的低温马氏体相。提出了一种在存在磁阻以及可能的磁化依赖性的情况下确定正常和异常霍尔效应系数的方法。合金的电阻率在马氏体转变过程中呈跳跃式增加，达到150-200μΩcm，并且几乎与温度无关。正常的霍尔效应系数为负，在T = 80 K时比镍高一个数量级，随温度升高单调降低，在奥氏体中接近零，并且在马氏体相变附近不发生急剧变化。在x = 3处，在马氏体相变的附近检测到正常的磁化霍尔效应非线性。在马氏体和奥氏体中，特别是在马氏体相变附近，异常霍尔效应系数的温度依赖性不能用偏斜散射，侧跳和异常霍尔效应的Karplus-Lutinger机理来描述。理论。讨论了这种行为在Heusler合金中的磁传输特性的可能原因。

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