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Is it possible to do PFM on a wide bandgap material deposited on an insulating substrate?
Thanks in advance to your responses
Since the electric field is causing the expansion or contraction of the ferroelectric material there is no need for a direct electrical connection (as would be required for TUNA or CAFM). There should be an electrode that is connected the the chuck behind the insulating layer, however.
--Bede
PFM can be performed on wide band gap materials, but generally you will want a conductive path from the sample stage to this material. So, often this type of material will be deposited on a bottom electrode for PFM. In your case, if you have an insulating substrate, then you could use silver paint or conductive tape (carbon, copper, ...) to form a conductive pathway from the microscope sample stage (or metal sampe puck) to the test material. This will allow the sample to be biased or grounded, depending on how you configure your PFM experiment.
I hope this helps. If you want to provide more details of the experiment, maybe we can help you further. Or you can email me directly at john.thornton(at)bruker-nano.com if you wish.
Thanks,
John