Check Optimized Vertical Domain PFM Parameters

Suggested initial scan parameters for Piezoresponse Force Microscopy (PFM) using the PFM Optimized Vertical Domains Operation workspace are detailed below. Parameters can be modified during scanning to obtain an optimized image. Most Piezoresponse control parameters can be found in the Piezo Response panel and have LS PR in the parameter name (LS refers to the low-speed lock-in setting, which its the default for this workspaceA collection of views and parameters organized for a specific imaging mode. Workspaces create an environment tailored to the selected imaging mode and give the user a start in the right direction toward optimizing imaging parameters.).

1. To reduce tip wear and increase resolution, set the Deflection Setpoint (in the Feedback panel) to a low value, 0.5 V is the default setting.
   • Decrease this later while looking at an image to lower the force applied to the sample, or increase it to ensure contact on a rough, but robust sample. This low value assumes a stiff cantilever (such as MESP-RC or SCM-PIT). 
   • For an NPG probe, set the Deflection Setpoint to 2.0 V instead.

Figure 1: Parameter setup for Vertical Domain Piezoresponse Microscopy

2. The following default settings should be in place in the Piezo Response panel (see Figure 1, above):
   • Lock-In Type: Low Speed
   • Vertical 16x Gain: Enabled (increase vertical sensitivity)
3. To further increase vertical sensitivity (by 6x), reduce the Deflection Limit in the Limits panel to 4.096 V.

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