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Giant magnetic field-induced strain due to rearrangement of variants in an ordered Fe_3Pt

机译：由于有序Fe_3Pt中变体的重排而导致的巨大磁场感应应变

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Magnetic field-induced strain due to rearrangement of martensite variants in a ferromagnetic Fe_3Pt alloy single crystal with degree of order of about 0.8 has been investigated. The alloy exhibits a martensitic transformation from an ordered L1_2-type structure to a tetragonal one at 85 K. The tetragonality of the martensite decreases as temperature decreases, and is about 0.945 at 14 K. When a magnetic field is applied along the [001]_P direction ('P' stands for 'parent' phase) at 4.2 K after cooling down to the temperature under zero magnetic field, the specimen contracts more than 1% along this direction due to the rearrangement of variants. In association with this contraction, the fraction of the variant whose easy axis (c axis) is parallel to the [001]_P direction reaches 70%. On the other hand, when the magnetic field is removed, a part of the strain initially induced by the magnetic field recovers and its value is 0.6% at 4.2 K. This recoverable strain repeatedly appears in the subsequent field applying and removing processes. The rearrangement of variants by a magnetic field is also confirmed by an X-ray measurement under the magnetic field. The energy dissipated due to the rearrangement of variants by the magnetic field is obtained from the magnetization curve to be about 180 kJ/m~3. Based on these results and the magnetocrystalline anisotropy constant of the martensite phase (K_u ≈ 500 kJ/m~3 at 4.2 K), the mechanism of rearrangement of variants under the magnetic field is discussed.
机译：已经研究了由于铁磁性Fe_3Pt合金单晶中马氏体变体的重排而引起的磁场感应应变，其阶数约为0.8。该合金在85 K时呈现出从有序L1_2型结构到四方结构的马氏体转变。马氏体的四方性随温度降低而降低，在14 K时约为0.945。当沿[001]施加磁场时在零磁场下冷却至4.2 K后，_P方向（“ P”代表“母体”相）在4.2 K时，由于变体的重新排列，样品沿该方向收缩超过1％。与该收缩相关联，其易轴（c轴）平行于[001] _P方向的变体比例达到70％。另一方面，当去除磁场时，最初由磁场引起的应变的一部分恢复，并且其值在4.2 K时为0.6％。这种可恢复的应变在随后的磁场施加和去除过程中反复出现。磁场对变体的重排也可以通过磁场下的X射线测量来确认。根据磁场的变化，由于磁场的变化，能量的耗散能量从磁化曲线中获得，约为180 kJ / m〜3。基于这些结果和马氏体相的磁晶各向异性常数（在4.2 K下K_u≈500 kJ / m〜3），讨论了在磁场下变体重排的机理。

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