Abstract
The magneto-optical (MO) properties of perpendicular magnetic Co80Pt20 nanostructures formed by the surface agglomeration of Ag were investigated under polar Kerr measurement conditions. A ZnO intermediate thin layer on a Ru underlayer promoted the Ag agglomeration to form the nanostructures and improved the perpendicular magnetic properties. The magnetic nanostructures consisting of CoPt layers and Ag fine grains had two magnetic regions with different coercivities. The antiparallel magnetic alignment between the CoPt layers on the Ag grains and on the Ru underlayer produced an increase in the Kerr rotation angle at a low magnetic applied field. This was explained by MO phase reversal in the CoPt layer on the Ag grains. The MO behaviors (enhancement and phase reversal of Kerr rotation) of the CoPt nanostructures are attributed to the influence of surface plasmon polaritons excited at the Ag grains.
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