Electro-magnetic properties of composites with aligned Fe-Co hollow fibers

Abstract

A novel Fe-Co binary hollow fiber was synthesized by electroless plating using hydrolyzed polyester fiber and its anisotropy characteristic was investigated for electromagnetic wave absorbing materials. The hollow fibers in parallel with magnetic field show higher saturated magnetization of 202 emu/g at the applied magnetic field of 10 kOe and lower coercivity (27.658 Oe), compared with the random and vertical oriented hollow fibers. From complex permittivity measurement, the Fe-Co hollow fiber composites clearly display a single dielectric resonance, located at ∼14 GHz. The Fe-Co hollow fibers not only provide excellent EM properties in GHz frequency ranges, resulting mainly from the strong resonance, but also adjust the soft magnetic properties through fiber alignments. The cavitary structure of the Fe-Co hollow fibers, not only giving rise to a dielectric loss resonance and also adjusting its peak frequency, may be a pathway to useful EM wave absorptive devices in GHz frequency ranges.

Electromagnetic Interference Shielding Behavior of Magnetic Carbon Fibers Prepared by Electroless FeCoNi-Plating

“…Materials 2021, 14, 3774 2 of 9 Hybrid materials containing carbon and soft magnetic materials have high potential for use as high-performance EMI shielding materials since they share the advantages of each material [36][37][38][39][40]. Thus, to hybridize carbon and soft magnetic materials, we prepared magnetic CFs by coating CFs with an FeCoNi alloy using an electroless plating method.…”