Nanoelectromechanical Systems for Low-Power Logic Applications

Nanoelectromechanical systems (NEMS) exploit mechanical motion at the nanoscale to perform switching and memory functions with orders of magnitude lower energy dissipation than conventional semiconductor devices. By physically making or breaking contacts or by modulating capacitive gaps, NEMS logic elements achieve virtually zero leakage in the off state and sub-picojoule switching energies, addressing the rising demand for energy-efficient computation in mobile, sensor and harsh-environment platforms. Key device motifs include electromechanically actuated relays and bistable switches that can be integrated alongside or within standard complementary metal-oxide-semiconductor (CMOS) processes. Challenges remain in scaling gap dimensions, ensuring reliability over millions of cycles, controlling stiction and pull-in phenomena, and integrating high-density back-end-of-line interconnects. Recent advances demonstrate wafer-scale compatibility, ultra-low voltage operation and intrinsic radiation hardness, highlighting the potential of NEMS to extend Moore’s law in the realm of ultra-low-power logic and memory architectures.

Research from Nature Portfolio

Recent studies have demonstrated nanoelectromechanical non-volatile memory devices with sub-10 fJ per bit programming energy, achieved through novel out-of-plane electrode architectures and electrothermal erase mechanisms. These devices not only attain ultra-low switching energies but also exhibit intrinsic resistance to radiation-induced degradation, making them suitable for aerospace and high-reliability computing. Complementary work has addressed electromechanical pull-in instability in electrostatically actuated relays, eliminating snap-in behaviour while preserving a constant actuation gap. This approach enables stable non-volatile relay operation at elevated temperatures, paving the way for integrated logic circuits that combine switching and memory functions under extreme conditions.

Nanoelectromechanical Systems for Low-Power Logic Applications publication trend

The graph below shows the total number of articles in nanoelectromechanical systems for low-power logic applications across all publications each year (not limited to Nature Index journals).

Technical terms

Nanoelectromechanical system (NEMS): A device combining electrical and mechanical functions at nanometre scales to perform switching or memory operations with minimal energy loss.

Electrostatic actuation: Movement induced by Coulombic attraction between charged electrodes, commonly used to open or close NEMS relays.

Electrothermal actuation: Mechanical displacement generated by thermally induced stress or buckling in a nanoscale structure, enabling low-voltage switching.

Pull-in instability: A nonlinear phenomenon in which an electrostatically actuated beam snaps into contact uncontrollably once a critical voltage is reached.

On/off current ratio: The ratio of electrical current in the conductive (on) state to that in the insulating (off) state, indicating the contrast and energy efficiency of a switch.

References

1. Sub-10 fJ/bit radiation-hard nanoelectromechanical non-volatile memory. Nature Communications (2023).
2. Integrated 4-terminal single-contact nanoelectromechanical relays implemented in a silicon-on-insulator foundry process. Nanoscale (2023).
3. Wafer‐Scale CMOS‐Compatible Electro‐Thermally Actuated Nanomechanical Non‐Volatile Switch with Out‐of‐Plane Electrode Configuration. Advanced Electronic Materials (2024).
4. Nanoelectromechanical relay without pull-in instability for high-temperature non-volatile memory. Nature Communications (2020).
5. Design and Demonstration of MEM Relay-Based Arithmetic and Sequential Circuit Blocks. IEEE Transactions on Electron Devices (2021).