Magnetoactive elastomers with controllable radio-absorbing properties

Magneto-active elastomers (MAEs) based on a silicon polymer matrix filled with magnetic carbonyl iron microparticles have been synthesized. Both isotropic samples and samples micro-structured by an external magnetic field have been obtained. The radio-absorbing properties of the MAEs have experimentally been studied in the frequency range 2-10 GHz and at the central work frequency 30 GHz of the range 26-38 GHz in the absence and in the presence of an external magnetic field of 0.3 T. It has been shown that both the reflection and transmission coefficients of the MAEs change considerably when the magnetic field is applied, besides, their values strongly depend on the direction of the magnetic field as well as on the internal filler structure of MAEs. The developed MAEs could be used as controllable by an external magnetic field radio-shielding or polarizing covers.