High-Shielding Coefficient and Low-Noise of Cobalt-Based Metallic Glass Magnetic Shielding Cylinder

作者：Peipei Shen, Shuyan Zhang, Danyue Ma, Bozheng Xing, Hua Chen, Mengshi Zhang, Huanqi Wei, Bo Li, Xinyu Miao, Meng Xie, Shuang Li, Yanan Gao, Yangzhi Xue, Pengfei Wang, Jixi Lu, Bangcheng Han · 发表于：IEEE Transactions on Instrumentation and Measurement · 年份：2025 · DOI：10.1109/tim.2025.3545841 · 被引用次数：7 · 研究领域：Electromagnetic Compatibility and Measurements、Magnetic Properties of Alloys、Electromagnetic Launch and Propulsion Technology

High-shielding coefficient and low-noise magnetic shielding systems play an important role in the field of ultrahigh-sensitive magnetic field sensors and biomagnetism measurements. Currently, the magnetic shielding systems often suffer from high intrinsic magnetic noise generated by$\mu $-metal. In this study, cobalt-based metallic glass with high permeability and excellent soft magnetic properties was employed to design magnetic shielding cylinders with an inner diameter of 240 mm. Using the finite element method (FEM) simulation, the shielding coefficient S of the single-layer cobalt-based metallic glass ($20~\mu $m thickness) magnetic shielding cylinder was 11.27 for the geomagnetic field. The magnetic noise characteristics of cobalt-based metallic glass magnetic shielding cylinder were analyzed based on complex permeability and resistivity in the obtained frequency band. In addition, we also experimentally studied the effectiveness of cobalt-based metallic glass magnetic shielding cylinder with different layers, when used as the innermost magnetic shielding layer, in suppressing the magnetic noise generated by$\mu $-metal. The experimental results show that the minimum magnetic noise of the ten-layer cobalt-based metallic glass magnetic shielding cylinder is only 1.3 fT/Hz$^{1/2}$, which indicates that cobalt-based metallic glass as an innermost magnetic shielding layer material can effectively reduce the magnetic noise generated by$\mu $-metal and verifies the superiorit...