The Piezo Force Module
For Electromechanical Measurements
Electromechanical coupling is one of the fundamental mechanisms underlying the functionality of many materials. These include inorganic, macro-molecular materials and many biological systems. The new Piezo Force Module from Asylum Research enables very high sensitivity, high bias, and crosstalk-free measurements on piezoelectrics (including biological systems in fluid), ferroelectrics and multiferroics. These capabilities are exclusively available on the MFP-3D™ AFMs.
Piezoresponse Force Microscopy
Resonant-Enhanced Imaging Modes
• Dual AC Resonance Tracking (DART)
These modes avoid the limitations of conventional sinusoidal cantilever excitation while using resonance enhancement to provide new information on local response and energy dissipation which cannot
High Voltage Characterizes Even the Weakest Piezoelectric Materials
Spectroscopy Modes for Polarization Applications
• Single-point hysteresis loop measurements (point and click)
These modes provide local measure of such parameters as coercive and nucleation biases, imprint, remanent response, and work of switching (area within the hysteresis loop), for correlation with local microstructure. Combined with the high-voltage module, these allow local polarization switching to be probed even in high-coercivity
1. S. Jesse, S. Kalinin, R. Proksch, A.P. Baddorf, B.J. Rodriguez, "The band excitation method in scanning probe microscopy for rapid mapping of energy dissipation on the nanoscale." Nanotechnology 18, 435503 (2007).
2. B.J. Rodriguez, C. Callahan, S. Kalinin, R. Proksch, "Dual-frequency resonance-tracking atomic
3. S. Kalinin, B.J. Rodriguez, S. Jesse, K. Seal, R. Proksch, S. Hohlbauch, I. Revenko, G. Thompson, A. Vertegel. "Towards local electromechanical probing of cellular and biomolecular systems in a liquid environment." Nanotechnology 18, 424020 (2007) .
4. See the R&D magazine Oct. ’07 article titled “A Biased View of the Nanoworld: Electromechanical Imaging by SPM.”
5. See the January 2008 Microscopy Today article "Nanoelectromechanics of Inorganic and Biological Systems: From Structural Imaging to Local Functionalities".
Specifications subject to change.
Rendered topography of a LiNbO3 sample with the PFM signal painted on top. Image was taken after switching spectroscopy mapping. Inset shows the hysteresis loops measured at an individual point, 4µm scan.
Topography of a red blood cell with the piezo response signal painted on top, 2µm scan. Image courtesy of B. Rodriguez and S. Kalinin, ORNL.
HVA220 High Voltage Amplifier
HV Sample Holder on the scanner
HV Sample Holder under the head
PFM Cantilever Holder
PFM phase images of externally poled PIMNT single crystals. A) The grounded tip travels along the plotted trajectory in contact mode, dwelling on each point for different duration times with an applied DC voltage. B) The time dependent poling gives insight into effective diffusion distance of the injected carriers.