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A complete magneto-optical characterization of Pt capped Ag-Co-Ag sputtered trilayers with varying Co thickness is presented. Polar Kerr rotation and ellipticity exhibit a gradual increase in signal as the Co layer gets thicker, with a sharp feature around 3.75 eV due to the bulk Ag plasmon resonance. The transverse Kerr signal of such trilayers is strongly affected by the surface plasmon polariton...