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HarmoniX and PeakForce QNM

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BrukerApplications posted on Tue, Jan 12 2010 1:01 PM

HarmoniX registers peak force as well, can the HarmoniX software use peak force as the feedback paramater

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HarmoniX is a TappingMode technique, meaning that the SPM feedback that controls the Z piezo extension (and indirectly the force) is designed to keep the tapping amplitude constant.  This is a proven mechanism for SPM imaging that has produced most of the best images and data in the literature for the last decade.

While HarmoniX can calculate the peak force, the calculation is not fast enough to make it practical for feedback, only for acquisition.  Delays in the calculation of the feedback signal can lead to damaged tips or samples.

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No, HarmoniX is a Tapping mode technique.  The probe is designed around the higher frequency spectrum of vibrations produced by tapping mode probe-sample interaction.  The NanoScopeV also uses 2 separate high speed lock-ins for HarmoniX that may have resolution issues at low frequencies.

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Top 10 Contributor
280 Posts
Points 6,221
Bruker Employee

HarmoniX is a TappingMode technique, meaning that the SPM feedback that controls the Z piezo extension (and indirectly the force) is designed to keep the tapping amplitude constant.  This is a proven mechanism for SPM imaging that has produced most of the best images and data in the literature for the last decade.

While HarmoniX can calculate the peak force, the calculation is not fast enough to make it practical for feedback, only for acquisition.  Delays in the calculation of the feedback signal can lead to damaged tips or samples.

  • | Post Points: 11
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