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Analysis of Ferroelectric Negative Capacitance-Hybrid MEMS Actuator Using Energy-Displacement Landscape
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  • Raghuram Tattamangalam Raman ,
  • Jeffin Shibu ,
  • Revathy Padmanabhan ,
  • Arvind Ajoy
Raghuram Tattamangalam Raman
Indian Institute of Technology Palakkad

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Jeffin Shibu
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Revathy Padmanabhan
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Arvind Ajoy
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We propose an energy-based framework to analyze the statics and dynamics of a ferroelectric negative capacitance-hybrid Microelectromechanical System (MEMS) actuator. A mapping function that relates the charge on the ferroelectric to displacement of the movable electrode, is used to obtain the Hamiltonian of the hybrid actuator in terms of displacement. We then use graphical energy-displacement and phase portrait plots to analyze static pull-in, dynamic pull-in and pull-out phenomena of the hybrid actuator. Using these, we illustrate the low-voltage operation of the hybrid actuator to static and step inputs, as compared to the standalone MEMS actuator. The results obtained are in agreement with the analytical predictions and numerical simulations. The proposed framework enables straightforward inclusion of adhesion between the contacting surfaces, modeled using van der Waals force. We show that the pull-in voltage is not affected, while the pull-out voltage is reduced due to adhesion. The proposed framework provides a physics-based tool to design and analyze negative capacitance based low-voltage MEMS actuators.
Jun 2022Published in IEEE Transactions on Electron Devices volume 69 issue 6 on pages 3359-3366. 10.1109/TED.2022.3164633