We performed a detailed theoretical study of the magneto-optical polar Kerr effect in magnetoplasmonic heterostructures consisting of a plasmonic film and a ferromagnetic layer with a corrugated top surface. Explicit analytical expressions allowing us to calculate the modifications of the polar Kerr effect in dependence on the thickness of the plasmonic and ferromagnetic layers as well as on the period and depth of the corrugation were derived. Interestingly, when applied to the test system of an Au/Co bilayer, our calculations show that the presence of corrugations is beneficial, as it allows us to tailor the magneto-optical response in a magnetoplasmonic composite in a resonant manner. This opens the possibility to enhance the strength of the Kerr effect by several orders of magnitude, which is beneficial for the investigation of systems in which magneto-optical responses are rather small, i.e., for characterization of biological or medical systems.
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