Dissipation of micro-cantilevers as a function of air pressure and   metallic coating
  In this letter, we characterize the internal dissipation of coated micro-cantilevers through their mechanical thermal noise. Using a home-made interferometric setup, we achieve a resolution down to 1E-14m/rtHz in the measurement of their deflection. With the use of the fluctuation dissipation theorem and of the Kramers-Kronig relations, we rebuilt the full mechanical response function from the measured noise spectrum, and investigate frequency dependent dissipation as a function of the air pressure and of the nature of the metallic coatings. Using different thicknesses of gold coatings, we discuss the source of the internal viscoelastic damping. 
Tianjun Li (Phys-ENS), Ludovic Bellon (Phys-ENS)
cond-mat.mtrl-sci physics.class-ph physics.ins-det