Anomalous magneto-optical Kerr effect in perpendicularly magnetized Co/Pt films on two-dimensional colloidal crystals

TL;DR

This study investigates the anomalous magneto-optical Kerr effect in Co/Pt films on 2D colloidal crystals, revealing how surface plasmon polaritons influence optical properties, with implications for nanosensor development.

Contribution

It demonstrates the correlation between magneto-optical spectra and surface plasmon resonances in Co/Pt films on colloidal crystals, highlighting a novel magnetoplasmonic interaction.

Findings

Magneto-optical Kerr spectra are affected by surface plasmon polaritons.

Spectra are correlated with optical reflectance.

Sphere diameter influences the resonant coupling.

Abstract

We have studied the magneto-optical Kerr effect and optical reflectance of perpendicular magnetized Co/Pt films on self-assembly two-dimensional polystyrene spheres. It is shown that the magneto-optical and the reflectance spectra are correlated to each other. Calculations have shown that the magneto-optical Kerr rotation and the Kerr ellipticity spectra are governed by the resonant coupling of light to the excitations of surface plasmon polaritons and modified by the sphere diameters. These effects lead to the possibility of developing new magnetoplasmonic nanosensors.