Clustering effect on frequency dependent magnetic properties of FeCo micro hollow fiber composites

FeCo hollow fibers can possess high anisotropy field due to their high aspect ratio. Thus composite sheets containing these fibers are applicable to nearfield electromagnetic wave absorption sheets in 1~10 GHz region. For an understanding of the high frequency properties of the composite sheets, the Landau-Lifshitz-Gilbert (LLG) equation including eddy current effect and the effective medium theory with an additional magnetostatic correction were applied to simulate the frequency dependency of their magnetic properties.