A novel low-noise Mu-metal magnetic shield with winding shape

A stable magnetic environment that is devoid of interference from ambient magnetic fields is crucial to precise measuring magnetic fields. In this study, a novel magnetic shield with a winding shape, similar to a spiral, is proposed to simultaneously increase the shielding coefficient and reduce the magnetic noise produced by the magnetic shield. In the winding-shaped magnetic shielding structure, an entire mu-metal strip is rolled into multiple layers to form a cylindrical barrel shape. Each layer is separated by insulating adhesives. The effects of the number of turns of the strip and the insulating adhesive on the shielding coefficient and the magnetic noise were analyzed. The simulation results demonstrated that the DC shielding coefficient of this novel structure increased by 123 % and the magnetic noise was reduced by 47 % compared to that of the conventional structures. In addition, the shielding coefficient and the magnetic noise of the two structures were experimentally measured, confirming the superiority of the proposed structure.