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Why the current noise increases dramatically when tip touches the sample?

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Top 25 Contributor
58 Posts
Points 652
stsolong posted on Tue, Jul 24 2012 10:22 AM

Hello,

I have a question concerning CAFM.

Once the tip contacts the sample surface, the current noise increases to 500pA with high sensitivity sensor. When I lift the tip up and off the surface, the current noise reduces to 2pA.

I don´t know it is normal or not. This situation does not happen for every sample.

Thanks!

 

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Top 25 Contributor
55 Posts
Points 831
Bruker Employee
Reply
Chunzeng Li replied on Fri, Jul 27 2012 1:43 PM

Hi Solong,

The noise level of the module is best charicterized when the tip is off the surface. But anyway, the noise should not go up to 500 pA; is it really noise or signal. can you send me a screenshot or the original file for me to take a close look?

Thanks

Chunzeng Li
Applicaiton Scientist
Nano Surfaces Division, bruker
chunzeng.li@bruker-nano.com

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