Magneto-plasmonics on perpendicular magnetic CoPt–Ag nanostructures with ZnO intermediate thin layers

The magneto-optical properties of perpendicular magnetic Co80Pt20–Ag nanostructures formed on Ru underlayer were investigated under polar Kerr measurement conditions. The nanostructures consisting of CoPt layers and Ag fine grains had two magnetic regions with different coercivities. ZnO intermediate thin layers improved the perpendicular magnetic properties and promoted the surface agglomeration of Ag to form the nanostructure. In the CoPt–Ag nanostructures, the antiparallel magnetic alignment of the CoPt layers on the Ag grains and Ru underlayer produced an increase in the Kerr rotation angle, and it was explained by the phase reversal in Kerr rotation for the CoPt layer on the Ag grains. These magneto-optical behaviors (enhancement and phase reversal in Kerr rotation) were attributed to the influence of the localized surface plasmon resonance of Ag grains on CoPt layers.

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