Efficient magnetic hysteresis model for field and stress application in magnetostrictive Galfenol
Efficient magnetic hysteresis model for field and stress application in magnetostrictive Galfenol
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DOI：
10.1063/1.3318494
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发表时间：
2010-03-15
影响因子：
3.2
通讯作者：
Dapino, M. J.
中科院分区：
文献类型：
--
作者：
Evans, P. G.;Dapino, M. J.
本文提出了一个离散的能量平均模型，描述了磁化强度和应变与磁场和应力的非线性和滞后关系。从能量最小化的解析表达式描述三维旋转的域容易的结晶方向的区域中的域旋转是主导过程，并提供了一种直接计算磁各向异性常数的手段。由于畴壁运动和畴旋转的联合作用，无滞后材料行为描述与能量加权平均，而滞后材料行为描述与畴体积分数的演化方程。由于使用了一组有限的局部定义的能量表达式，而不是一个单一的全球定义的表达式，该模型是100倍的速度比以前的能量加权模型，是准确的材料与任何磁晶各向异性。该模型被用来解释磁化和应变测量>取向的Fe 79.1Ga 20.9和Fe 81.5Ga 18.5以及>取向的Fe 81.6Ga 18.4。
We present a discrete energy-averaged model for the nonlinear and hysteretic relation of magnetization and strain to magnetic field and stress. Analytic expressions from energy minimization describe three-dimensional rotations of domains about easy crystal directions in regions where domain rotation is the dominant process and provide a means for direct calculation of magnetic anisotropy constants. The anhysteretic material behavior due to the combined effect of domain rotation and domain wall motion is described with an energy weighted average while the hysteretic material behavior is described with an evolution equation for the domain volume fractions. As a result of using a finite set of locally defined energy expressions rather than a single globally defined expression, the model is 100 times faster than previous energy weighting models and is accurate for materials with any magnetocrystalline anisotropy. The model is used to interpret magnetization and strain measurements of > oriented Fe79.1Ga20.9 and Fe81.5Ga18.5 as well as > oriented Fe81.6Ga18.4.