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Enhancement of the magneto-optical activity via surface plasmon resonance on Au-Co nanocomposite thin films

K. Yang, C. Clavero, J. Skuza, R.A. Lukaszew
College of William and Mary, US

Keywords: nanocomposite, magneto-optical activities, surface plasmon resonance


We find that the Au-Co nanocomposite thin films grown at 300 ºC, which exhibit segregate nano-cluster microstructure and smooth surface capable of SPP propagation, exhibit largest magneto-optical effects than the films grown at lower and higher temperatures, as expected from our discussion on the correlation between SPR excitation and microstructure. We also note that the magneto-optical activity also increases with increasing Co concentration consistent with the presence of more magnetic material in the films, while the angular resolution of the field-dependent change of the reflectivity at resonance is somewhat insensitive to the amount of Co present. Our studies open up new possibilities for optimizing nano-composite materials that combine suitable properties, i.e. optical and magnetic, for applications that benefit from modulated sensing schemes, such as novel sensors based on SPR technology.
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