Investigation of the effect of spatial dispersion in a metal shell of a non-spherical magnetoplasmonic nanoparticle

Based on the method of discrete sources, the effect of spatial dispersion in the metal shell of a magnetoplasmonic nanoparticle on the absorption of electromagnetic energy is studied. Hybrid particle is composed of a magnetic core Fe$_3$O$_4$ or Fe$_2$O$_3$ and a golden shell. The influence of the elongation of spheroidal particles on the level of energy absorption is considered. It is shown that taking into account the spatial dispersion in the shell leads to a decrease in the absorption cross section to 30% and is accompanied by a shift of the plasmon resonance to the short-wavelength region down to 25 nm. It is found that averaging the absorption cross section over the directions of propagation of external excitation and polarizations entails a threefold decrease in the level of absorbed energy.