Nonlinear Detection of Ultrasonic Vibrations in an Atomic Force Microscope

Kolosov, Oleg and Yamanaka, K (1993) Nonlinear Detection of Ultrasonic Vibrations in an Atomic Force Microscope. Japanese Journal of Applied Physics, 32 (8A). L1095-L1098. ISSN 0021-4922

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A new method is proposed to detect ultrasonic vibration of the samples in the Atomic Force Microscope (AFM) using nonlinearity in the tip-sample interaction force curve F(z). Small amplitude ultrasonic vibration less than 0.2 nm is detected as an average displacement of a cantilever. This Ultrasonic Force Mode (UFM) of operation is advantageous in detecting ultrasonic vibration with frequencies up to the GHz range, using an AFM cantilever with a resonant frequency below 100 kHz. It was found that a strong repulsive force is acting after an ultrasonic amplitude threshold of the is crossed, with the amplitude of this threshold depending upon the average force applied to the tip.

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Journal Article
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Japanese Journal of Applied Physics
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05 Oct 2012 14:23
Last Modified:
16 Sep 2023 00:45