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Ag as a surfactant for Co/MgO(111)-( )R 30°
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Mg 2 Region XP Spectrum for Co/Ag/MgO(111)-( ) 30°.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

(Color online) Ag 3 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 4 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.

Image of FIG. 4.
FIG. 4.

(Color online) Progression of Co deposition on 2.5 ML Ag/MgO(111)-( )30°. Arrow indicates direction of continuing Co deposition.

Image of FIG. 5.
FIG. 5.

(Color online) Peak area behavior for multiple depositions of Co on 2.5 ML Ag/MgO(111)-( )30°. 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.

Image of FIG. 6.
FIG. 6.

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.

Image of FIG. 7.
FIG. 7.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ag as a surfactant for Co/MgO(111)-(3×3)R 30°