ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
We have investigated the formation of textured and epitaxial metallic films on (100) MgO single crystals substrates (lattice constant a=4.21 A(ring)) as a function of deposition temperature during pulsed laser ablation. Platinum (a=3.92 A(ring)) films on MgO with lattice misfit of 7.4% were found to grow epitaxially in the temperature range 500–700 °C. Three-dimensional x-ray diffraction results (theta, phi, and chi scans) show 〈100〉 epitaxy with the alignment of all three cube axes. Rutherford backscattering and channeling measurements on a film deposited at 700 °C showed a minimum yield of 2.2%, which is very close to the defect-free single crystal value. In the temperature range 200–500 °C both 〈100〉 and 〈111〉 textures were observed. The 〈111〉 oriented (normal to the surface) films were random in the plane of the substrate, whereas 〈100〉 crystallites were epitaxial. Below 200 °C, only 〈111〉 crystallites were observed. The 〈111〉 texture of platinum films is also observed when grown on amorphous substrates such as SiO2. The experimental results are normalized with theoretical simulations addressing the minimization of film energy.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.111693
