Magnetic field-assisted construction of ordered ferromagnetic nanowire fibers with enhanced microwave absorption and high stability electromagnetic interference shielding

The use of electromagnetic interference (EMI) fabrics spun with metal fibers is an effective measure for personal protection against high electromagnetic radiation. To address the limitations of traditional metal fiber-coated shielding effectiveness (SE) fabrics, which often underperform, this study proposes the development of ferrimagnetic fiber composites with excellent absorption properties. By employing magnetic field structuring to create an ordered structure, the goal is to produce shielding fabrics with high absorption SE and strong mechanical stability. This paper introduces a magnetic field ink control method to construct an ordered conductive network. The EMI SE of fabrics prepared using the magnetic ink control method reached 40.74 dB, which is higher than that of samples prepared using simpler control methods (34.76 dB). The fabric prepared with this method retains 88 % and 92 % of its original EMI SE after 1000 bending and 500 twisting cycles, respectively, which is significantly better than the performance of samples prepared with simpler control methods (54 % and 48 %). The Specific Absorption Rate (SE_A/SE) is 93 %, higher than the 87 % achieved by simpler methods. This work provides a new approach for the development of high-EMI SE fabrics.