| Autor: |
Irissou, Eric, Vidal, François, Johnston, Tudor, Chaker, Mohamed, Guay, Daniel, Ryabinin, Anatoly N. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 2/1/2006, Vol. 99 Issue 3, p034904, 14p, 2 Color Photographs, 2 Diagrams, 3 Charts, 9 Graphs |
| Abstrakt: |
A cross-beam pulsed laser deposition (CBPLD) system operated at variable pressure in an inert (He) background atmosphere was used to deposit films from two dissimilar targets (Pt–Ru and Pt–Au). Using this setup, we showed that films with mixed Pt–Au and Pt–Ru composition can be prepared over the whole compositional range, from [Pt] = 0 to 100 at. %. Films deposited at He pressure higher than 1.6 Torr are fairly homogeneous and the standard deviation of the Pt concentration over the whole area of the deposit is less than 1 at. %. Using a diaphragm located at the interaction zone between the two plasmas, a drastic reduction of the normalized droplet density was observed, from about 700×102 cm-2 nm-1 in conventional PLD to 6×102 cm-2 nm-1 in CBPLD. The deposition rate increases as the pressure is increased from vacuum to an optimal He pressure. The deposition rate decreases again for higher He pressure. The optimal operating conditions are P(He)=2 Torr for Pt–Ru and P(He)=4 Torr for Pt–Au. In these conditions, the deposition rates are, respectively, ∼32% and ∼22% of what they would be in conventional PLD. The behavior of the deposition rate with the He pressure is consistent with what can be concluded from a visual observation of the interaction of the plasma plumes at various pressures. A simple model considering the quadratic dependence of the velocity on the flow resistance of heavy particles in the rarefied light ambient particles is developed to understand the role of the background gas in the deposition rate. This model succeeds in predicting a maximum in the deposition rate versus He pressure curve, allowing us to get a better physical understanding of what is going on during the interaction between the two plasma plumes. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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