Improvement of stepped magnetoimpedance properties by controlling the demagnetizing effect
Improvement of stepped magnetoimpedance properties by controlling the demagnetizing effect
复制标题
通过控制退磁效应改善阶梯磁阻抗特性
DOI：
10.1109/tmag.2015.2441748
复制
发表时间：
2015
影响因子：
2.1
通讯作者：
K. Ishiyama
中科院分区：
文献类型：
--
作者：
H. Kikuchi;S. Kamata;S. Oe;T. Nakai;S. Hashi;K. Ishiyama
研究了控制退磁场分布对阶梯形巨磁阻抗元件阻抗分布的影响。由于退磁场在椭球内是均匀的，因此采用椭球形单元来改善阻抗不连续跳跃的特性。椭球单元的阻抗跳变变得更尖锐、更突变，其高比常规矩形单元高比提高了3-4倍。观察到的磁畴结构在矩形单元中从边缘向中心传播，这是根据计算的退磁因子的分布解释的。另一方面，所有的域出现或消失的椭圆形单元，表明退磁因子是几乎恒定的元素。结果有助于元件的小型化，以保持突变的不连续阻抗。
We investigated the effects of controlling the distribution of the demagnetizing field on the impedance profiles of stepped giant magnetoimpedance elements. Elements with an ellipsoidal shape were adopted to improve the properties in discontinuous impedance jumps, as the demagnetizing field is expected to be uniform in an ellipsoid. The impedance jumps in the ellipsoidal elements became sharper and more abrupt, and the height ratio improved by 3-4 times compared with the ratio of the conventional rectangular elements. The observed domain structures propagated from the edge to the center in the rectangular elements, which is explained on the basis of the calculated distribution of the demagnetizing factor. On the other hand, all the domains appeared or disappeared in the ellipsoidal elements, indicating that the demagnetizing factor is nearly constant in the elements. The results contribute to a miniaturization of the element in order to keep the abrupt discontinuous impedance.