负磁致伸缩非晶丝扭转应力巨磁阻抗模型
Modeling of torsion stress giant magnetoimpedance in amorphous wires with negative magnetostriction
摘要：
提出了一个描述扭转应力对负磁致伸缩非晶丝巨磁阻抗效应影响的模型。通过求解麦克斯韦方程组和Landau-Lifshitz方程，假设扭转应力引起的磁弹性各向异性的空间分布简化，得到了导线阻抗。分析了阻抗随外部磁场、扭转应力和频率的变化。结果表明，磁阻抗比的扭转依赖关系具有不对称的形状，在某一值的扭转应力与尖锐的峰值。计算的阻抗场和应力依赖性与钴基非晶丝扭转应力巨磁阻抗效应的实验研究结果定性一致。
英文摘要：
A model describing the influence of torsion stress on the giant magnetoimpedance in amorphous wires with negative magnetostriction is proposed. The wire impedance is found by means of the solution of Maxwell equations together with the Landau-Lifshitz equation, assuming a simplified spatial distribution of the magnetoelastic anisotropy induced by the torsion stress. The impedance is analyzed as a function of the external magnetic field, torsion stress and frequency. It is shown that the magnetoimpedance ratio torsion dependence has an asymmetric shape, with a sharp peak at some value of the torsion stress. The calculated field and stress dependences of the impedance are in qualitative agreement with results of the experimental study of the torsion stress giant magnetoimpedance in Co-based amorphous wires.
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