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研究了Terfenol-D材料中巨磁致伸缩的逆效应,即磁机械效应.基于Stoner-Wohlfarth(SW)模型,考虑磁晶各向异性和应力各向异性能,依据自由能极小原理,获得了退磁态下Terfenol-D单晶中磁化强度方向和压应力的关系.采用数值方法求解了平衡条件下的非线性方程组.理论结果表明,Terfenol-D巨磁致伸缩单晶中的磁各向异性取决于磁晶各向异性和应力各向异性之间的竞争.在压应力的作用下,Terfenol-D单晶中的磁各向异性由立方向单轴转变.理论和实验结果的比较表明,存在一个临界压应力,使磁致伸缩效应达到极大值.该理论结果还解释了压应力使得Terfenol-D单晶材料难于磁化和磁致伸缩效应出现极大值的实验事实.理论计算不仅为研究这类问题提供了一个更准确的方法,而且其结果也有助于理解类似材料中的磁化过程.
The inverse effect of giant magnetostriction in Terfenol-D material, ie, the magneto-mechanical effect, was studied.According to the Stoner-Wohlfarth (SW) model, considering the magnetocrystalline anisotropy and stress anisotropy energy, The relationship between the magnetization direction and the compressive stress in the Terfenol-D single crystal under the demagnetization condition is solved.The numerical solution of the nonlinear equations under equilibrium conditions is obtained.The theoretical results show that the magnetic properties of the Terfenol-D giant magnetostrictive single crystal The anisotropy depends on the competition between the magnetocrystalline anisotropy and the stress anisotropy. The magnetic anisotropy in the Terfenol-D single crystal is transformed from the unidirectional to the uniaxial direction under compressive stress. The comparison between theoretical and experimental results The results show that there is a critical compressive stress that maximizes the magnetostrictive effect.The theoretical results also explain the experimental facts that the compressive stress makes the Terfenol-D single crystal material hard to magnetize and the magnetostriction effect to a maximum value. Not only does it provide a more accurate method of studying such problems, but the result also helps to understand the magnetization process in similar materials.