-
We us a thermal accessory that can heat a sample to ~250C. The sample heater can be used with a cantilever holder that will heat the probe to the same temperature. Usually large temperature steps require a re-tune of the lever as the resonance shifts with temperature. The probes and certain samples could probably tolerate much higher temperatures but
-
PFQNM on various samples from the polymer kit.
-
Peak Force Tapping has similarity to "jumping mode" and "pulse force' mode; as well as differences. Similarities: Both peak force tapping (PFT) and jumping mode acquire the entire force curve at each measurement point or pixel; cantilever operates below its resonance frequency; they can use any lever of user's choice; Difference
-
The noise floor of a ScanAsyst height image is approximately the same as from a Tapping Mode or HarmoniX height image. \]
-
With HarmoniX signal to noise is an issue on the vertical deflection axis only at integer multiples of the tapping drive frequency but not at the feedback frequency. The offset tip used in HarmoniX enhances the signal-to-noise at integer multiples of the tapping drive frequency on the lateral axis. A complete spectrum of these harmonics are required
-
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.
-
From draft version of PeakForce QNM application note: Comparison with Tapping & HarmoniX As mentioned earlier, TappingMode Phase Imaging is another popular method for material property mapping. TappingMode uses cantilevers that are relatively stiff and the cantilever is vibrated near the fundamental resonant frequency of the cantilever. The system
-
HarmoniX is a secondary mode based on TappingMode. The feedback control remains tapping amplitude. HarmoniX uses special torsional probes and reconstructs tapping force curves from lateral deflection signals. PeakForce QNM mode is a primary imaging mode that directly generates force curves while feedback precisely controls the peak force. Currently
-
To avoid duplicated pixels, the HarmoniX property channel maximum scan rate is 0.5Hz for 512 samples/line images. Multimode 8 and Dimension Icon SPMs can have a PeakForce QNM property channel scan rate of 1Hz for 512 samples/line images. I.e. the speed gain is about 2X. The maximum scan rate of the BioScope Catalyst is 0.5Hz for 512 samples/line images