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Giant magneto impedance effect of Co-rich amorphous fibers under magnetic interaction
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2020-07-27 , DOI: 10.1007/s12613-020-1968-5
Shu-ling Zhang , Wei-ye Chen , Ning Cui , Qian-qian Wu , You-liang Su

The quasi-metallic fibers were selected from 1 to 40 pieces and connected in parallel in this study. The giant magneto impedance (GMI) effect of Co-based melt extract fibers in the bundle mode was investigated, and the distribution of the surface circumferential magnetic field on the fibers was also analyzed. Such distribution was induced by the driving current, which gave rise to the circular magnetization process and the GMI effect. The improved GMI effect with much higher field sensitivity was observed in these fiber bundles. Results show that the field sensitivities of the four-fiber and six-fiber bundles reach 19.5 V·m·kA−1 (at 1 MHz) and 30.8 V·m·kA−1 (at 5 MHz). The circumferential magnetic field distributed throughout the fiber’s circumferential surface is rearranged and becomes uneven due to the magnetic interaction among fibers. There are both strengthened and weakened magnetic field parts around these fibers’ surfaces. The strengthened magnetic field improves the circumferential domain magnetization of the surface, resulting in larger GMI effects. However, the weakened parts inhibit the circumferential magnetization process and, therefore, the GMI effect. This also induces greater magnetization damp because of the increased domain interactions under the strong skin effect. The co-effect between the magnetic domains and the circumferential magnetization induces the optimization of the GMI effect in the four-fiber bundles. The observed GMI effect proves that fibers in bundle form can modify the sensitivity of the GMI effect. Moreover, different fiber bundles could be tuned according to the working conditions in order to manipulate the GMI response.



中文翻译:

富钴非晶纤维在磁相互作用下的巨磁阻抗效应

在这项研究中,准金属纤维从1到40条中选择并并联。研究了Co基熔体抽提纤维在束模式下的巨磁阻抗(GMI)效应,并分析了其表面周向磁场在纤维上的分布。这种分布是由驱动电流引起的,从而引起了圆形磁化过程和GMI效应。在这些纤维束中观察到了改进的GMI效应,具有更高的场灵敏度。结果表明,四纤和六纤束的场灵敏度分别达到19.5 V·m·kA -1(在1 MHz时)和30.8 V·m·kA -1(在5 MHz时)。由于纤维之间的磁性相互作用,分布在整个纤维圆周表面的圆周磁场重新排列并变得不均匀。这些纤维表面周围的磁场部分都有所增强和减弱。增强的磁场改善了表面的周向磁化强度,从而导致更大的GMI效应。但是,弱化部分会抑制周向磁化过程,因此会抑制GMI效应。由于在强集肤效应下增加的磁畴相互作用,这也引起更大的磁化阻尼。磁畴和周向磁化强度之间的共同效应导致四纤维束中GMI效应的优化。观察到的GMI效应证明,成束纤维可以改变GMI效应的敏感性。此外,可以根据工作条件调整不同的光纤束,以控制GMI响应。

更新日期:2020-07-27
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