Influence of Magnetic Field on Dielectric Permittivity of Nanocomposites on the Base of Polymeric Matrix: Collagen, Polystyrole, and Magnetite Nanoparticles

This paper deals with the investigation of the kinetics of nanocomposite polarization based on polymeric matrix: 1) collagen; 2) polystyrole; and 3) magnetite nanoparticles in perpendicular electric and magnetic fields. It is shown that magnetic field influences the buildup of nanoparticle polarization plane into the electric field. The influence of magnetic field on the dielectric permittivity of nanocomposites has been determined. It is shown that by changing the magnetic field within 0 ≤ H₀ <; 0.75(εε₀/μμ₀)^1/2E, the value of nanocomposite dielectric permittivity decreases and at H₀ = 0.75(εε₀/μμ₀)^1/2E, it has a minimum value, but beginning with H₀ ≥ 0.75(εε₀/μμ₀)^1/2E, it increases. It is shown that magnetic field also influences the depolarization of magnetite nanoparticles. While changing the direction of the magnetic field, one can accelerate or retard the depolarization of magnetite nanoparticles.

I. Introduction

Study of nanocomposites based on the polymeric matrix and magnetite nanoparticles is a high-priority task and has a great scientific and practical value [1]–[5]. It is related to their unique physical properties such as: 1) superparamagnetism of ferromagnetic nanoparticles; 2) huge magnetic resistance; 3) high magnetorefractive effect; 4) ability of changing specific electric resistance over a wide range; and 5) good magneto-optical properties [6]–[9].