Sharpening contact resonance spectra in UAFM using Q-control

Kenji Fukuda, Hiroshi Irihama, Toshihiro Tsuji, Keiichi Nakamoto, Kazushi Yamanaka

Research output: Contribution to journalConference articlepeer-review

13 Citations (Scopus)


Ultrasonic atomic force microscopy (UAFM) is a new scientific tool for reliable measurement of nano-scale elasticity based on the resonance frequency measurement of AFM cantilever in the contact mode. This paper proposes Q-control for improving resolution of contact mode resonance spectra. First, we perform a theoretical analysis using a distributed mass model for the UAFM cantilever. Next, we confirm experimentally that the Q factor is actually improved by applying Q-control. In the theoretical analysis, we analyze the effect of Q-control for the higher resonance, which cannot be analyzed by the point mass model, and we demonstrate that the optimum phase is different by almost π between the first and the second resonance. Although, the optimum phase is almost constant -π/2 in the first resonance, it turns out that it changes with damping in the second resonance. This behavior is discussed in terms of the vibration mode shape.

Original languageEnglish
Pages (from-to)1145-1151
Number of pages7
JournalSurface Science
Publication statusPublished - 2003 Jun 10
EventProceedings of the 7th International Conference on Nanometer - Malmo, Sweden
Duration: 2002 Aug 292002 Aug 31


  • Atomic force microscopy
  • Contact
  • Piezoelectric effect

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry


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