Numerical Computation of Effective Electromagnetic Parameters of Anisotropic Magnetic Nanocomposites of Ferromagnetic Nanoparticles Embedded in Carbon Nanotubes at Microwave and THz Frequencies

Using the model of gyromagnetic nanostructured medium the electrodynamic technique of numerical computation of electromagnetic properties of anisotropic magnetic nanocomposites based on the nanomagnet gratings of aligned carbon nanotubes (CNTs) with ferromagnetic nanoparticles (FNs) embedded inside CNTs is developed. The results of a numerical study of components of the effective permeability tensor (in the case of the longitudinal DC magnetic field) and the transverse effective permeability (in the case of the transverse DC magnetic field) as a function of the external DC magnetic field intensity for the various concentration of FNs in a CNT were obtained. The anisotropy of the effective permeability and its tunability by the magnitude and the orientation of bias magnetic field (relative to the direction of electromagnetic propagating and the CNT axis), the concentration of FNs in a CNT and the geometry of grating were investigated at ferromagnetic resonance at microwave and terahertz frequencies.