Dissipation in a gold nanomechanical resonator at low temperatures

Venkatesan, A. and Lulla, K. J. and Patton, M. J. and Armour, A. D. and Mellor, C. J. and Owers-Bradley, J. R. (2010) Dissipation in a gold nanomechanical resonator at low temperatures. Journal of Low Temperature Physics, 185. ISSN 0022-2291

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Abstract

We present results from a study of the dissipation in nanomechanical gold resonators. We fabricated a nanomechanical resonator consisting of a gold wire of width 300 nm, thickness 80 nm and length 7.5 μm by etching away the underlying GaAs substrate. At low temperatures the resonator had a fundamental frequency of about 7.95 MHz, in part due to tension arising from differential thermal contraction between the gold beam and the underlying semiconductor substrate. The dissipation in the resonator was measured using the magnetomotive method over the temperature range 1 K to 10 mK. We find that the Q-factor of the resonator increases by more than a factor of four between 600 mK and 10 mK. The dissipation follows a weak power law dependence on temperature, ∝T0.5, from approximately 30 mK to 600 mK.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Low Temperature Physics
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3104
Subjects:
ID Code:
87148
Deposited By:
Deposited On:
24 Jul 2017 12:20
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Jan 2020 10:24