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EFM Sample - Picture request

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David Durham posted on Wed, May 19 2010 3:11 PM

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Hi Everyone,

Is there an image out there that shows what our EFM test sample should look like when imaged correctly? (Image of the sample is below, for reference.)

Also, does anyone know what material that the lines in the middle of the sample are made of? I'm looking at the schematic and it is clear that most of the sample is made of Cr, but the line-material is unclear.

Thanks,

Dave

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Thomas Mueller replied on Wed, May 19 2010 8:00 PM

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The lines are Cr, like the pads. The lines are like intedigitated fingers, so when you scan across them, there is an alternation of a line connected to the right pad and subsequent line connected to the opposite pad. And when you connect the wires to a DC voltage source and scan across the fingers in surface potential microscopy mode (Kelvin Probe Force Microscopy, KPFM), you see alternating potential values. Below is such an image obtained with the Innova using single pass (dual frequency) KPFM mode.