[Spm] help on force-distance data analysis

[Jan Friis Jorgensen]

Dear Raj,

The SPIP program can calculate the Force vs. Deflection curves automatically and “normalize” them by a “Base line correction” method.

You can download an evaluation version for free at www.imagemet.com/download and learn more about force curve analysis by SPIP at http://www.imagemet.com/index.php?id=14&main=products&sub=modules and

http://www.imagemet.com/WebHelp/spip.htm#force_menu.htm

 

Best regards,

Jan F. Jorgensen

Image Metrology

 

 

From: Vinayaraj OK [mailto:rajok at in.com] 
Sent: 27. marts 2010 21:56
To: spm at spmlist.di.com
Subject: [Spm] help on force-distance data analysis

 

Hello dear SPMers,

I need your help on data analysis of force-distance curves using AFM. I am using Veeco Multimode AFM with version 6.14 software.

Considering the photodetector sensitivity calibrated and knowing the spring constant of the cantilever, we could calculate the Force data which is the Y-axis. This is by first multiplying the photodetector voltage value with the photodetector sensitivity (which gives the deflection value 'd' in nm) and then multiplying it with the spring constant.
I am confused on the X-axis. Initially for X-axis we have the 'height position of the piezoelectric translator' - Z. To get the actual distance between the tip and the surface,

is it by adding the Z with d or by substracting?
should I consider the signs of any of the values. Because my raw data include both positive and negative values for the Z ?

Another question is regarding the post measurement normalisation. I was not using the trigger mode and hence all the curves are not set to Zero force deflection line and equal trigger threshold.
Is there any easy method (or some software) by which I can normalise the different curves so that I can compare them?

Expecting your valuable comments. Thanking you,

best regards
--
Raj






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