Magnetic Permeability Behaviors of FeCo Micro Hollow Fiber Composites

Abstract

To achieve near-field electromagnetic wave absorption in the 1 - 10 GHz region, magnetic particles with high saturation magnetization (M-S) and high anisotropy field (H-a) have been widely used to fabricate composite sheets. Unlike for M-S, H-a can easily be controlled by managing the shape of the magnetic particles. Thus, hollow fibers with high H-a appear to be a good candidate material for fabricating high frequency absorbing sheets. However, the details of frequency dependent permeability behaviors of these fibers and sheets have not been fully understood. In this study, we aimed to develop a simulation method by which to study the magnetic permeability of the fibers and sheets. To confirm the validity of the simulation method, FeCo hollow fibers were fabricated using electroless deposition on micro polymer fibers, after which they were incorporated into composite sheets. The magnetic behavior of the sheets was also analyzed.