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Time Resolved In-Situ Diffuse X-ray Scattering Measurements of the Surface Morphology of Homoepitaxial SrTiO3 Films During Pulsed Laser Deposition

Published online by Cambridge University Press:  01 February 2011

John David Ferguson Jr
Affiliation:
jdf48@cornell.edu, Cornell University, Materials Science and Engineering, 214 Bard Hall, Cornell University, Ithaca, NY, 14853, United States, 607 379-0980
Arthur R. Woll
Affiliation:
aw30@cornell.edu, Cornell University, Cornell High Energy Synchrotron Source, Ithaca, NY, 14853, United States
Gokhan Arikan
Affiliation:
ga49@cornell.edu, Cornell University, Applied and Engineering Physics, Ithaca, NY, 14853, United States
Darren S. Dale
Affiliation:
dd55@cornell.edu, Cornell University, Cornell High Energy Synchrotron Source, Ithaca, NY, 14853, United States
Aram Amassian
Affiliation:
aram.amassian@polymtl.ca, Cornell University, Materials Science and Engineering, Ithaca, NY, 14853, United States
Mark W. Tate
Affiliation:
mwt5@cornell.edu, Cornell University, Department of Physics, Ithaca, NY, 14853, United States
Joel D. Brock
Affiliation:
jdb20@cornell.edu, Cornell University, Applied and Engineering Physics, Ithaca, NY, 14853, United States
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Abstract

Homoepitaxial SrTiO3 thin films were grown on SrTiO3 (001) using Pulsed Laser Deposition (PLD). The deposition process was monitored in-situ, via both x-ray reflectivity and surface diffuse x-ray scattering measurements in the G3 experimental station at the Cornell High Energy Synchrotron Source (CHESS). Using a CCD detector in 1D, or streak-camera, mode with approximately 0.3-second time resolution, data were collected during growths performed at two substrate temperatures: 695°C and 1000°C. While the specular reflectivity oscillations for the two growths are very similar, the diffuse scattering clearly shows a distinct change in the peak position. Using Atomic Force Microscopy (AFM), we illustrate how the peak position for the diffuse lobes of scattered intensity is directly related to the distribution of single unit cell high islands on the growing surface. Thus, the peak shift of the diffuse scattering indicates an order of magnitude change in the island density.

Type
Research Article
Copyright
Copyright © Materials Research Society 2008

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Time Resolved In-Situ Diffuse X-ray Scattering Measurements of the Surface Morphology of Homoepitaxial SrTiO3 Films During Pulsed Laser Deposition
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Time Resolved In-Situ Diffuse X-ray Scattering Measurements of the Surface Morphology of Homoepitaxial SrTiO3 Films During Pulsed Laser Deposition
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Time Resolved In-Situ Diffuse X-ray Scattering Measurements of the Surface Morphology of Homoepitaxial SrTiO3 Films During Pulsed Laser Deposition
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