Faraday Effect and Magnetic Circular Dichroism in Media with Magneto-Plasmonic Nanoparticles and Two-Particle Clusters

The Faraday rotation and magnetic circular dichroism (MCD) in media containing spherical layered nanoparticles with a ferromagnetic core and a plasmon shell or two-particle clusters consisting of ferromagnetic and plasmonic nanoparticles are studied theoretically. Optical absorption spectra, MCD spectra, the orientation angle of the polarization ellipse, and the ellipticity of the light wave are calculated for these systems in the quasistatic approximation of electrodynamics. It is shown that the magneto-optical response of media with magneto-plasmon inclusions depends on the size of the ferromagnetic component of the inclusion. Moreover, this dependence is more pronounced for layered particles, and the response in the region of plasmon resonance of the noble metal is greater than for two-particle clusters.