Details

Autor(en) / Beteiligte

• Paolino, P
• Bellon, L

Titel

Frequency dependence of viscous and viscoelastic dissipation in coated micro-cantilevers from noise measurement

Ist Teil von

• Nanotechnology, 2009-10, Vol.20 (40), p.405705-405705

Ort / Verlag

England: IOP Publishing

Erscheinungsjahr

2009

Quelle

MEDLINE

Beschreibungen/Notizen

• We measure the mechanical thermal noise of soft silicon atomic force microscope cantilevers. Using an interferometric setup, we obtain a resolution down to 10(-14) m Hz(-1/2) on a wide spectral range (3-10(5) Hz). The low frequency behavior depends dramatically on the presence of a reflective coating: almost flat spectra for uncoated cantilevers versus a 1/f like trend for coated ones. The addition of a viscoelastic term in models of the mechanical system can account for this observation. Use of Kramers-Kronig relations validate this approach with a complete determination of the response of the cantilever: a power law with a small coefficient is found for the frequency dependence of viscoelasticity due to the coating, whereas the viscous damping due to the surrounding atmosphere is accurately described by the Sader model.