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Rearrangement of variants in Ni_2MnGa under magnetic field

机译：磁场下Ni_2MnGa中变体的重排

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摘要

Magnetic field-induced strain which appears in association with rearrangement of variants in a stoichiometric Ni_2MnGa single crystal exhibiting a martensitic transformation at 202 K has been investigated. The tetragonality of the martensite phase decreases slightly as temperature decreases and its value at 77 K is about 0.940. When the field is applied along the [001]_P ('P' stands for the parent phase) direction after cooling down to 77 K under zero magnetic field, the specimen contracts along this direction. In association with this contraction, the fraction of the variant whose c axis (easy axis of magnetization) lies along the field direction increases and reaches about 100%. When the specimen is cooled under magnetic field of 3.2 MA/m applied along [001]_P, this fraction reaches 100% at the martensitic transformation temperature of 202 K. The energy dissipated due to rearrangement of variants by magnetic field is nearly the same as that obtained from its Stress-strain curve. The maximum shear stress by the magnetic field acting on the twinning plane is evaluated to be about 2.5 MPa from its uniaxial magnetocrystalline anisotropy constant (310 kJ/m~3 at 77 K). This is an adequate value because it is larger than the shear stress required for the rearrangement of variants (1.2-2.2 MPa) obtained by compressive tests.
机译：研究了在化学计量的Ni_2MnGa单晶中在202 K处表现出马氏体相变的，与变体重排相关的磁场感应应变。马氏体相的四方性随温度降低而略有降低，其在77 K时的值约为0.940。在零磁场下冷却至77 K后，沿[001] _P（“ P”代表母相）方向施加磁场时，样品沿该方向收缩。伴随着这种收缩，c轴（易磁化轴）沿着磁场方向的变体比例增加，并达到约100％。当样品在沿[001] _P施加的3.2 MA / m的磁场下冷却时，该分数在202 K的马氏体转变温度下达到100％。由于磁场对变体的重新排列而耗散的能量几乎与从其应力-应变曲线获得的应力。从单轴磁晶各向异性常数（在77 K下为310 kJ / m〜3），磁场作用于孪晶面上的最大剪切应力约为2.5 MPa。这是一个适当的值，因为它大于通过压缩测试获得的变体重新排列所需的剪切应力（1.2-2.2 MPa）。

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