Superior electromagnetic properties of oriented silica-coated planar anisotropy carbonyl-iron particles in quasimicrowave band

Abstract

For the sake of thinner electromagnetic wave absorbers used in quasimicrowave band, the composite containing planar anisotropy carbonyl-iron (PACI) coated with amorphous SiO 2 particles were rotationally oriented in an external magnetic field. The oriented PACI/SiO 2 particles possess higher permeability, higher permittivity and lower matching thickness ( t m) in quasimicrowave band compared with the nonoriented ones. The decrease in matching thickness of the oriented composite could be well explained by the increase of μ and ε due to rotational orientation. The oriented PACI/SiO 2 core–shell material exhibits great potential for application of thinner absorber in quasimicrowave frequency range.