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Giant magneto impedance effect of Co-rich amorphous fibers under magnetic interaction

International Journal of Minerals,Metallurgy and Materials 2020年第10期27卷 1415-1420页

作者： Shu-ling Zhang Wei-ye Chen Ning Cui Qian-qian Wu You-liang Su School of Mechanical&Automotive Engineering Qingdao University of TechnologyQingdao 266520China School of Material of Science and Engineering North Minzu UniversityYinchuan 750021China School of Mechanical Engineering Ningxia UniversityYinchuan 750021China

The quasi-metallic fibers were selected from 1 to 40 pieces and connected in parallel in this *** 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 *** distribution was induced by the driving current,which gave rise to the circular magnetization process and the GMI *** improved GMI effect with much higher field sensitivity was observed in these fiber *** 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 *** are both strengthened and weakened magnetic field parts around these fibers’*** strengthened magnetic field improves the circumferential domain magnetization of the surface,resulting in larger GMI ***,the weakened parts inhibit the circumferential magnetization process and,therefore,the GMI *** also induces greater magnetization damp because of the increased domain interactions under the strong skin *** co-effect between the magnetic domains and the circumferential magnetization induces the optimization of the GMI effect in the four-fiber *** observed GMI effect proves that fibers in bundle form can modify the sensitivity of the GMI ***,different fiber bundles could be tuned according to the working conditions in order to manipulate the GMI response.

关键词： giant magneto impedance metallic fibers magnetization sensitivity

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