8-12 GHz下焦耳退火和拉伸微线中双曲率形状磁阻抗分布的理解
Understanding of double-curvature shaped magnetoimpedance profiles in Joule-annealed and tensioned microwires at 8-12 GHz
摘要：
首次研究了电流和应力对消失磁致伸缩富钴微丝在微波频率下巨磁阻抗特性的综合影响。当电流退火的丝受到一定的拉伸应力时，可以观察到MI分布的场依赖性从宽峰的平滑形状到尖锐峰的变形形状的急剧转变，在每一侧上出现扭结。结果表明，在焦耳退火、电流产生的磁场和拉应力的共同作用下，形成了三个不同的区域-芯、内壳和外壳。临界场随退火电流的增大，场灵敏度由外壳层向内壳层逐渐降低，并向低值方向移动。我们成功地适应了我们的核壳模型的核壳壳模型，通过指定不同的各向异性场为每个区域满意地解决了独特的双曲率形状的峰值在现场导数MI配置文件。
英文摘要：
We have investigated for the first time the combined effect of current and stress on the GMI characteristics of vanishing-magnetostrictive Co-rich microwires at microwave frequency. As the current-annealed wire is subject to certain tensile stress, one can observe a drastic transformation of field dependence of MI profiles from smooth shape of a broad peak to deformed shape of a sharp peak with the emergence of a kink on each side. It follows that three different regions- core, inner and outer shell -have been formed by the combined effect of Joule annealing, current generated magnetic field and the tensile stress. A critical field sees a drop of field sensitivity from outer to inner shell and shifts to lower value with increasing annealing current. We successfully adapted our core-shell model to a core-shell-shell model by designating different anisotropy field for each region to satisfactorily resolve the unique double-curvature shaped peaks in the field derivative MI profiles.
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