Quantification of surface displacements and electromechanical phenomena via dynamic atomic force microscopy

Nina Balke, Stephen Jesse, Pu Yu, Ben Carmichael, Sergei V. Kalinin, Alexander Tselev

Research output: Contribution to journalArticlepeer-review

97 Scopus citations

Abstract

Detection of dynamic surface displacements associated with local changes in material strain provides access to a number of phenomena and material properties. Contact resonance-enhanced methods of atomic force microscopy (AFM) have been shown capable of detecting ∼1-3 pm-level surface displacements, an approach used in techniques such as piezoresponse force microscopy, atomic force acoustic microscopy, and ultrasonic force microscopy. Here, based on an analytical model of AFM cantilever vibrations, we demonstrate a guideline to quantify surface displacements with high accuracy by taking into account the cantilever shape at the first resonant contact mode, depending on the tip-sample contact stiffness. The approach has been experimentally verified and further developed for piezoresponse force microscopy (PFM) using well-defined ferroelectric materials. These results open up a way to accurate and precise measurements of surface displacement as well as piezoelectric constants at the pm-scale with nanometer spatial resolution and will allow avoiding erroneous data interpretations and measurement artifacts. This analysis is directly applicable to all cantilever-resonance-based scanning probe microscopy (SPM) techniques.

Original languageEnglish
Article number425707
JournalNanotechnology
Volume27
Issue number42
DOIs
StatePublished - Sep 15 2016

Funding

Experiments were planned and conducted through support provided by the US Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division through the Office of Science Early Career Research Program (NB). The facilities to perform the experiments were provided at the Center for Nanophase Materials Sciences, which is sponsored at Oak Ridge National Laboratory by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy, which also provided additional support for simulation of cantilever dynamics and advanced data analysis (SJ, BC, SVK, AT). PY provided the ferroelectric PZT sample with support from the National Basic Research Program of China (Grant No. 2015CB921700) and National Natural Science Foundation of China (Grand No. 11274194).

Keywords

  • cantilever dynamics
  • ferroelectrics
  • scanning probe microscopy

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