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Proceedings Paper

Quantitative elastic-property information with acoustic AFM: measurements and modeling
Author(s): Donna C. Hurley; Joshua S. Wiehn; Joseph A. Turner; Paul Rice
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Paper Abstract

To investigate nanoscale mechanical behavior, new approaches using dynamic modes of the atomic force microscope cantilever are being developed. One method, atomic force acoustic microscopy (AFAM), measures cantilever resonances in the acoustic frequency range to obtain elastic-property information. We describe quantitative AFAM measurements and compare them to results from techniques like surface acoustic waves and instrumented indentation. With AFAM we examined a niobium film using two separate calibration samples and two cantilever geometries. Depending on the cantilever type we found M=105-114 GPa, in good agreement with literature values of M=116-133 GPa for bulk niobium and M=120 GPa obtained with surface acoustic waves. We also obtained AFAM values of M=54-81 GPa for the indentation modulus of an aluminum film. In comparison, literature values for bulk aluminum are M=76-81 GPa, while other results on the same film yielded M=78-85 GPa. To understand the results more thoroughly, we compare two methods of AFAM spectrum analysis. The analytical approach assumes a cantilever of uniform rectangular cross-section while the finite-element model accounts for spatial variations in cantilever dimensions. The same data are interpreted with the two approaches to better understand measurement uncertainty and accuracy.

Paper Details

Date Published: 7 June 2002
PDF: 9 pages
Proc. SPIE 4703, Nondestructive Evaluation and Reliability of Micro- and Nanomaterial Systems, (7 June 2002); doi: 10.1117/12.469632
Show Author Affiliations
Donna C. Hurley, National Institute of Standards and Technology (United States)
Joshua S. Wiehn, Univ. of Nebraska/Lincoln (United States)
Joseph A. Turner, Univ. of Nebraska/Lincoln (United States)
Paul Rice, National Institute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 4703:
Nondestructive Evaluation and Reliability of Micro- and Nanomaterial Systems
Norbert Meyendorf; George Y. Baaklini; Bernd Michel, Editor(s)

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