Abstract

The giant magnetoimpedance effect in a glass-coated Fe-based amorphous microwire annealed under stresses is theoretically studied. The magnetization distribution in a microwire is described within a model that takes into account the presence in the sample of two regions with different types of magnetic anisotropy. It is assumed that, in the central part of the microwire, the anisotropy is longitudinal and, in the surface region, an induced helicoidal anisotropy arises as a result of annealing. An expression for the impedance of the microwire with allowance for different permeabilities of the two regions is found. The obtained theoretical dependences of the impedance on an external field and frequency make it possible to qualitatively describe the results of experimental studies of the magnetoimpedance in glass-coated Fe-based amorphous microwires.

中文翻译：

---

用感应磁各向异性模拟非晶微线中的巨磁阻效应

摘要

理论上研究了在应力下退火的玻璃涂层铁基非晶微丝中的巨磁阻抗效应。在模型中描述了微丝中的磁化分布，该模型考虑了样品中存在具有不同类型的磁各向异性的两个区域。假定在微丝的中心部分，各向异性是纵向的，并且在表面区域，由于退火而产生了感应的螺旋各向异性。找到了微丝阻抗的表达式，其中考虑了两个区域的不同磁导率。所获得的阻抗对外部场和频率的理论依赖性使得可以定性地描述玻璃涂层的铁基非晶微线中磁阻抗的实验研究结果。