Tuning the Scattering Parameters of Magnetic Nanowire Arrays Near the Antiresonance at Photonic Frequencies

Abstract

The diffraction of electromagnetic waves on arrays of ferromagnetic metallic (iron) nanowires at photonic frequencies is modeled at electromagnetic accuracy by solving the 3-D diffraction problem for Maxwell's equations with electrodynamic boundary conditions, complemented by the Landau-Lifshitz equation including the exchange term. Using the computational algorithm based on the decomposition approach by autonomous blocks with Floquet channels (FABs), the scattering parameters of the S matrix of 2-D magnetic nanowire arrays, depending on the bias magnetic field H 0 , were calculated for nanowire diameters 10 < 2r < 60 nm at a frequency of 30 THz. It is shown that when the conditions for radial antiresonance modes for the 2-D nanomagnet array are fulfilled, a maximum in electromagnetic wave transmission can be realized and controlled by the array geometry and external bias field.