Abstract
The determination of the spring constants of atomic force microscope (AFM) cantilevers is of fundamental importance to users of the AFM. In this paper, a fast and nondestructive method for the evaluation of the spring constant which relies solely on the determination of the unloaded resonant frequency of the cantilever, a knowledge of its density or mass, and its dimensions is proposed. This is in contrast to the method of Cleveland et al. [Rev. Sci. Instrum. 64, 403 (1993)], which requires the attachment of masses to the cantilever in the determination of the spring constant. A number of factors which can influence the resonant frequency are examined, in particular (i) gold coating, which can result in a dramatic variation in the resonant frequency, for which a theoretical account is presented and (ii) air damping which, it is found, leads to a shift of ∼4% in the resonant frequency down on its value in a vacuum. Furthermore, the point of load on the cantilever is found to be extremely important, since a small variation in the load point can lead to a dramatic variation in the spring constant. Theoretical results that account for this variation, which, it is believed will be of great practical value to the users of the AFM, are given.
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Dates
Type | When |
---|---|
Created | 23 years ago (July 26, 2002, 9:50 a.m.) |
Deposited | 1 year, 6 months ago (Feb. 10, 2024, 10:39 a.m.) |
Indexed | 1 day, 6 hours ago (Aug. 20, 2025, 9:23 a.m.) |
Issued | 30 years, 1 month ago (July 1, 1995) |
Published | 30 years, 1 month ago (July 1, 1995) |
Published Print | 30 years, 1 month ago (July 1, 1995) |
@article{Sader_1995, title={Method for the calibration of atomic force microscope cantilevers}, volume={66}, ISSN={1089-7623}, url={http://dx.doi.org/10.1063/1.1145439}, DOI={10.1063/1.1145439}, number={7}, journal={Review of Scientific Instruments}, publisher={AIP Publishing}, author={Sader, John E. and Larson, Ian and Mulvaney, Paul and White, Lee R.}, year={1995}, month=jul, pages={3789–3798} }