Abstract
Oscillating probe atomic force microscopy in fluids is simplified when an oscillating force is applied directly to a magnetized cantilever using a solenoid. The response of the detector is simpler than that obtained with acoustic excitation. Reliable operation over a broad frequency range is achieved with excitation amplitudes of a few nm. This lower amplitude appears to facilitate imaging by means of small asperities on the tip. Images of a DNA plasmid bound weakly to mica in water have a full width of 5 nm when scanned with tips of a nominal macroscopic radius of curvature of 50 nm.
Original language | English (US) |
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Pages (from-to) | 4111-4113 |
Number of pages | 3 |
Journal | Applied Physics Letters |
Volume | 69 |
Issue number | 26 |
DOIs | |
State | Published - Dec 23 1996 |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)