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Micro-structure properties of (Co 1.2 nm/Au 2 nm) &#x00D7;N = 20 multilayers (MLs) prepared using dc-magnetron sputtering are reported using X-ray reflectivity (XRR) and X-ray diffraction (XRD) analysis. XRR profiles of these MLs showed excellent bilayer periodicity. The XRD spectra displayed Co layer thickness-dependent properties. Annealing increased lateral tensile strain, however, decreased compressive strain along the substrate normal direction. While surface roughness, crystallite grain size, and strain are affected by Co layer thickness, microstructure and periodicity are dominated by fcc-Au (111). Surface plasmon resonance (SPR) and magneto-optic SPR (MOSPR) study of an optimized Co/Au multilayer in Kretschmann configuration for air-He and water-methanol media showed an enhancement in sensitivity by over 4X when excited at &#x03BB; = 785 nm compared to the conventional SPR configuration when excited at &#x03BB; = 632.8 nm. This enhancement in MOSPR sensitivity means that the detection limit of this class of transducers can be substantially improved by tuning Co/Au layer thickness, wavelength, and incident angle of optical radiation.

Microstructure, Surface Plasmon, Magneto-Optic Surface Plasmon, and Sensitivity Properties of Magneto-Plasmonic Co/Au Multilayers