Permittivity of magnetic fluids with multiwalled carbon nanotubes under magnetic field effect

Materials with controlled electromagnetic characteristics are studied in the present work. The complex permittivity spectra of ferrofluids with the following composition: synthetic oil + iron oxide + multiwalled carbon nanotubes (MWCNTs) have been measured using impedance spectroscopy. The multiwalled carbon nanotubes (0.5 and 0.75 wt.%) were added to the composition. The effect of different orientations of the magnetic field relative to the electric field component of an electromagnetic wave on the complex permittivity values is considered. New research results indicate that thin layers of ferrofluid show promise for enhancing safety when using high-frequency radio-electronic devices.