Studying materials with controlled electromagnetic characteristics is presented in the paper. The complex permittivity spectra of ferrofluids of the following composition were measured by impedance spectroscopy: synthetic oil + iron oxide + MWCNTs. Multiwall carbon nanotubes (0,5 and 0,75 wt. %) were added to composition. The effect of different orientation of a magnetic field with respect to the electric component of the electromagnetic field on the complex permittivity values is considered. New results proving the promise of using relatively thin ferrofluid layers for solving problems of ensuring life safety when using modern high-frequency radio-electronic devices were obtained.
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