It is well known that a smooth substrate with step surface is important for growing epitaxial films. Recently, I encountered this problem on LaSrAlO4 and MgO substrates. I have tried H3PO4 etching for MgO, and NaOH etching for LaSrAlO4, accompanied with high temperature annealing. However, the treated surfaces are not satisfactory.
Can anyone tell me better methods to treat them?
Lunyong Zhang! How do you characterize the nano-structure of your LaSrAlO4 substrates?
Tried real time Bragg XRD Microscopy?
We were able to look right through a 50nm LaSrCuO4 MBE epi at the substrate (001) LaSrAlO4.. The estimated penetration depth in the substrate would be in excess of 10um. Love to figure out the penetration depth for the (004) symmetric LaSrAlO4/LaSrCuO4 XRD Rocking Curve. Would really appreciate if one of you wizards could help me out. The sample was graciously provided by Dr. Ivan Bozovic at the Condensed Matter Group BNL NY. So was the equipment used to acquire the raw XRD real time video data. We are in gratitude and appreciate the support.
Here is a YouTube video example: http://www.youtube.com/watch?v=FZpsgNXGHsc&list=PL7032E2DAF1F3941F
Many other materials in the play list as well.
Just imagine "High Resolution NDE Micrographs of Material Nano-structure"! NO ETCH MICROGRAPH
http://www.flickr.com/photos/85210325@N04/8583658032/in/photostream
Ravi
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