Damping of metallized bilayer nanomechanical resonators at room temperature

Seitner, Maximilian J.; Gajo, Katrin; Weig, Eva M.

doi:10.1063/1.4902430

Cited by 15 publications

(9 citation statements)

References 39 publications

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“…The spatial profile of graphene eigenmodes can be mapped by probing thermal noise spectra at varying positions on the graphene membrane, see SI. The slight elliptical structure and the frequency splitting observed on higher order modes reflects the presence of a residual 20 MPa stress along the diagonal direction [23,24], attributed to the graphene transfer process. Also visible on the thermal noise spectrum are sharp peaks corresponding to higher order eigenmodes of the Si 3 N 4 nanomembrane, whose fundamental mode oscillates around 100 kHz.…”

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confidence: 99%

Deviation from the Normal Mode Expansion in a Coupled Graphene-Nanomechanical System

et al. 2016

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We optomechanically measure the vibrations of a nanomechanical system made of a graphene membrane suspended on a silicon nitride nanoresonator. When probing the thermal noise of the coupled nanomechanical device, we observe a significant deviation from the normal mode expansion. It originates from the heterogeneous character of mechanical dissipation over the spatial extension of coupled eigenmodes, which violates one of the fundamental prerequisite for employing this commonly used description of the nanoresonators' thermal noise. We subsequently measure the local mechanical susceptibility and demonstrate that the fluctuation-dissipation theorem still holds and permits a proper evaluation of the thermal noise of the nanomechanical system. Since it naturally becomes delicate to ensure a good spatial homogeneity at the nanoscale, this approach is fundamental to correctly describe the thermal noise of nanomechanical systems which ultimately impact their sensing capacity.

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confidence: 99%

Deviation from the Normal Mode Expansion in a Coupled Graphene-Nanomechanical System

et al. 2016

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“…As an added benefit, for materials such as stoichiometric silicon nitride, the high internal tension that draws a doubly clamped beam taut enough to become stringlike leads to correspondingly high mechanical quality factors. These high values aid in detection [29][30][31] and are maintained even in the presence of a metallic overlayer added to the device for the purpose of functionalization [32,33].…”

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confidence: 96%

Time-Resolved Mass Sensing of a Molecular Adsorbate Nonuniformly Distributed Along a Nanomechnical String

Biswas

Miriyala

et al. 2015

Phys. Rev. Applied

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We show that the particular distribution of mass deposited on the surface of a nanomechanical resonator can be estimated by tracking the evolution of the device's resonance frequencies during the process of desorption. The technique, which relies on analytical models we have developed for the multimodal response of the system, enables mass sensing at much higher levels of accuracy than is typically achieved with a single frequencyshift measurement and no rigorous knowledge of the mass profile. We report on a series of demonstration experiments, in which the explosive molecule 1,3,5-trinitroperhydro-1,3,5-triazine (RDX) is vapor deposited along the length of a silicon nitride nanostring to create a dense, random covering of RDX crystallites on the surface. In some cases, the deposition is biased to produce distributions with a slight excess or deficit of mass at the string midpoint. The added mass is then allowed to sublimate away under vacuum conditions, with the device returning to its original state over about 4 h (and the resonance frequencies, measured via optical interferometry, relaxing back to their pre-mass-deposition values). Our claim is that the detailed time trace of observed frequency shifts is rich in information-not only about the quantity of RDX initially deposited but also about its spatial arrangement along the nanostring. The data also reveal that sublimation in this case follows a nontrivial rate law, consistent with mass loss occurring at the exposed surface area of the RDX crystallites. arXiv:1501.05647v2 [cond-mat.mes-hall]

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“…( 1)). Moreover, adding a metal component is known to change the mechanical damping of nano-strings 37,38 . 1) and ( 2).…”

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confidence: 99%

Magnetoelasticity of $\mathrm{Co_{25}}\mathrm{Fe_{75}}$ thin films

Schwienbacher,

Pernpeintner,

Liensberger

et al. 2019

Preprint

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We investigate the magnetoelastic properties of Co 25 Fe 75 and Co 10 Fe 90 thin films by measuring the mechanical properties of a doubly clamped string resonator covered with multi-layer stacks containing these films. For the magnetostrictive constants we find λ Co25Fe75 = (−20.68 ± 0.25) × 10 −6 and λ Co10Fe90 = (−9.80 ± 0.12) × 10 −6 at room temperature. In stark contrast to the positive magnetostriction previously found in bulk CoFe crystals. Co 25 Fe 75 thin films unite low damping and sizable magnetostriction and are thus a prime candidate for micromechanical magnonic applications, such as sensors and hybrid phonon-magnon systems.

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Damping of metallized bilayer nanomechanical resonators at room temperature

Cited by 15 publications

References 39 publications

Deviation from the Normal Mode Expansion in a Coupled Graphene-Nanomechanical System

Deviation from the Normal Mode Expansion in a Coupled Graphene-Nanomechanical System

Time-Resolved Mass Sensing of a Molecular Adsorbate Nonuniformly Distributed Along a Nanomechnical String

Magnetoelasticity of $\mathrm{Co_{25}}\mathrm{Fe_{75}}$ thin films

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