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- W2891764553 abstract "The denominated surface charge scraping mechanism was discovered in 2014 by using a new Atomic Force Microscopy (AFM) based mode called Charge Gradient Microscopy. The measurements to probe such mechanism are achieved with the use of a current-to-voltage converter: a transimpedance amplifier (TIA). However, the use of an incorrect approximation, named Gain BandWidth Product (GBWP) to calculate TIAs BandWidth (BW) could mislead to an incorrect data interpretation. By measuring at higher frequencies than permitted, the amplifier is used as a current-to-voltage converter, in conditions where it behaves as a charge-to-voltage converter. In this manuscript, we report the specific conditions in which the transfer function of the same electronic circuit topology is valid, while we spot both ringing and unstable amplifiers artifacts in the published data. We finally perform physical measurements in similar conditions as reported, but fully respecting the BandWidth (BW) of the system. We find that the charge collected is way below the values reported in such publication, diminishing or even nullifying the impact of a possible charge scrapping mechanism. These findings pave the way to employ Direct Piezoelectric Force Microscopy (DPFM) as a fast ferroelectric nanoscale characterization tool." @default.
- W2891764553 created "2018-09-27" @default.
- W2891764553 creator A5048664424 @default.
- W2891764553 date "2018-09-07" @default.
- W2891764553 modified "2023-09-23" @default.
- W2891764553 title "Fast and direct visualization of piezo-generated charges at the nanoscale using direct piezoelectric force microscopy" @default.
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- W2891764553 doi "https://doi.org/10.48550/arxiv.1809.02339" @default.
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