(Color online) Mg 2p Region XP Spectrum for Co/Ag/MgO(111)-( ) R30°.
LEED pattern (a) before and (b) after deposition of 1.9 ML of Ag. The overall intensity of the LEED pattern was reduced upon Ag deposition. The images have been contrast enhanced using ImageJ software by changing the maximum in intensity from 255 to 100 using the “Adjust” feature. The lookup table has been inverted.
(Color online) Ag 3d behavior upon annealing. Upon annealing to 600 °C, the intensity of the Ag signal increases. The intensity increase also occurred for the features attributed to the Ag 4p signal. The spectra shown had 2.5 ML Ag deposited at RT, followed by 5.0 ML Co, also deposited at RT. The sample was then annealed to 600 °C.
(Color online) Progression of Co deposition on 2.5 ML Ag/MgO(111)-( )R30°. Arrow indicates direction of continuing Co deposition.
(Color online) Peak area behavior for multiple depositions of Co on 2.5 ML Ag/MgO(111)-( )R30°. The behavior of the Mg and Co peaks are consistent with Co islanding behavior. Notice that both of the Ag peaks increase in intensity with additional deposition, indicating they are not being completely buried by the deposited Co. The atomic concentration ratios level off after the first half of the deposition cycle.
AFM Images of Ag/MgO(111) samples (a) without Co and (b) with Co. The sample in (a) has 9 ML of Ag, while the sample in (b) has 2.5 ML of Ag. The sample in (a) has no Co, while (b) has had an equivalent of approximately 119 ML of Co deposited atop the Ag while the sample was held at 450 °C.
AFM images comparing (a) 28 ML Co/MgO sample to (b) 119 ML Co/Ag/MgO sample. The presence of Ag significantly affects the growth mode of Co grown on MgO.
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