中文摘要：

采用多畴结构模型,考虑非晶带具有180°畴壁的磁畴及其两面的偏置磁场方向的不同,根据自由能最小原理,Maxwell方程组及带阻尼项的Landau-Lifshitz方程,建立了非晶态合金带在横向偏置磁场作用下的巨磁阻抗效应的理论计算公式.提出并采用四状态平均磁导率代替单畴模型获得的磁导率,得到了更符合实际的处于偏置场作用的阻抗随外磁场变化的理论结果.

英文摘要：

Taking into account the amorphous alloy ribbon with the 180° magnetic domain walls and transverse bias magnetic field,and adopting multi-domain structure model,the theory of giant magneto-impedance （ GMI） effect was found by minimizing the total free energy and by the solution of the Maxwell’s equations combining with Landau-Lifshitz equation. A new four-state method is proposed to calculate the average magnetic permeability of four states of the amorphous materials,which is used to replace the permeability obtained based on the single domain model. The method has an advantage in explaining the GMI effect over the theory established by single domain model.