Drops deformation influence on the microwaves interaction with a magnetodielectric emulsion

Abstract

Experimental and theoretical studies of the interaction of microwave radiation with a frequency of 8.2 GHz with magnetodielectric emulsions under the influence of an external magnetic field causing deformation of the emulsion dispersed phase droplets have been carried out. The values of the external magnetic field strength are such that no ferromagnetic resonance is observed in the system at a given radiation frequency. The studies were carried out when a rectangular waveguide was partially filled with a sample cell in the form of a thin plate. It is established that the deformation of magnetic droplets of the emulsion significantly affects the absorption of electromagnetic energy. The value of the droplet concentration at which the maximum response of the system is observed is determined. The features of the phenomenon of nonreciprocal phase shift, which have no analogue in solid-state magnetic materials, are found. To interpret the results obtained, a model of an ensemble of non-interacting isotropic superparamagnetic particles was used.