Magnetized Plasma with Ferrite Grains as Tunable Anisotropic left Handed Media

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Addis Ababa University


Since the report made by Veselago in 1968 about materials with negative refractive index, and strictly speaking since the experimental realization in 2000 by R. Shelby, et. al. of artificially constructed materials exhibiting negative index, many investigators and scholars became interested and devote their time and knowledge in search of these negative index (NI) materials, either from artificially engineered materials or to derive them from naturally occurring materials. This thesis is devoted to the analysis of the electrodynamics and the dispersion properties of magnetized plasma with ferromagnetic grains (MPFG) in a constant magnetic field. A magnetized plasma naturally is not transparent to light for some range of frequency. This range of frequency which the magnetized plasma is not transparent, obviously, is a range in which the permittivity is negative. So, if, in some way, we introduce magnetically active materials into the magnetized plasma in such a way to enhance its magnetic activity we may achieve a magnetic resonance, a dispersion related with magnetic response of magnetized grains to the variable magnetic field. The mathematical analysis and the different graphs against the frequency of the wave show that in a relatively narrow frequency band !M (!M is the ferromagnetic resonance frequency) both the magnetic permeability and the electric permittivity have negative value and the MPFG behaves as a NI material. That is, the introduction of the ferrite grains makes the magnetized plasma transparent to the electromagnetic wave for the range of frequency where the ordinary plasma is nontransparent. Moreover, in this range of frequency the phase and group velocity of the electromagnetic wave are opposite, which is one of the criterion for the left-handed media



Magnetized Plasma with Ferrite