SEM image for 50 nm thick Co:Au films with a concentration ratio of 50:50 and grown at RT, , and , respectively.
STEM Z-contrast images, EEL spectra and Co composition maps based on EELS/STEM (insets) for two nanocomposite samples. (a) Sample grown at with Co 5% Au 95% and EELS spectrum. The white rectangle shows the region where an EELS spectrum image of in size was acquired. Inset: STEM Co compositional map. (b) STEM Z-contrast image of the sample grown at with Co 40% Au 60% and EELS spectrum. The white rectangle shows the region where an EELS spectrum image of in size was acquired. Inset: Co compositional map. The right panels show single pixel EEL spectra corresponding to the edge after background subtraction for both samples (the acquisition time was 1 s per pixel). PCA was applied to remove random noise to the spectrum image in (a). The Co maps were obtained through spectrum imaging after subtracting the background using a power law fit and integrating a window 20 eV wide below the edge around 779 eV. Note: the grayscales on both Co maps are not the same.
Optical constants (left column: , right column: ) for Co:Au nanocomposite films with composition ratio of (a) 10:90, (b) 30:70, and (c) 50:50. The optical constants of bulk Co and Au are plotted for comparison, along with the optical constants for nanocomposite films with identical concentrations calculated using MG and Bruggeman effective medium approximations.
Angular dependence of the reflectivity in the Kretschmann configuration for Co–Au nanocomposite films grown at RT, 300, and with concentration ratios of (a) 10:90, (b) 30:70, and (c) 50:50. Experimental data are shown on the left column whereas simulations are shown on the right column.
Angular dependence of the MOKE in the transversal configuration for (a) Co:Au nanocomposite films with concentration ratio of 10:90 and grown at different temperatures and (b) nanocomposite films grown at with different Co concentrations.
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