Theoretical calculation of magneto-optical properties in cobalt nanotube array with hexagonal symmetry

The extended Fourier components and effective electric dipole model allowing for the proper treatment of magneto-optical (MO) activity are presented. The scattering-matrix approach is employed to analyze the MO properties of hexagonal array of magnetic metallic nanotubes embedded in a dielectric medium in the presence of magnetic field. It is found the MO properties of the nanotube array are more prominent than those of the nanodisk array for the same value of the cobalt filling ratio in specific wavelength range. The spectral position of the Kerr maxima can be tuned by the nanotubeʹs length, wall thickness, separation of the neighboring nanotubes and the filling medium.