Nonvolatile Flip-Flop Design for Low Power Applications

Nonvolatile flip-flops integrate nonvolatile memory elements directly into standard sequential circuits, most commonly employing spintronic magnetic tunnel junctions to preserve state without power. This architecture delivers zero standby power and instant restoration of context, making it ideal for battery-limited and intermittently powered devices. Key challenges include managing write-energy and area overheads, ensuring reliable data recovery under supply-voltage scaling, and mitigating read-disturbance effects. Contemporary designs focus on optimising restore yield in near- and subthreshold regimes, simplifying sensing circuits to enhance robustness, and leveraging hybrid schemes that reuse CMOS infrastructure alongside spin-orbit-torque mechanisms. Advances in selective state retention and dynamic power-gating further reduce leakage and wake-up latencies, underpinning energy-efficient edge intelligence and sustainable computing platforms.

Research from Nature Portfolio

No recent Nature Portfolio content available.

Nonvolatile Flip-Flop Design for Low Power Applications publication trend

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

Technical terms

Nonvolatile flip-flop: A sequential logic element that retains its stored value when the power supply is removed.

Magnetic tunnel junction (MTJ): A spintronic device with two distinct resistance states used for nonvolatile data storage.

Spin-transfer-torque: A mechanism whereby a spin-polarised current induces switching of an MTJ’s magnetic state.

Restore yield: The probability that a nonvolatile element correctly retrieves its stored data after power cycling.

Power gating: A technique to disable power to idle circuit blocks, thereby reducing standby leakage current.

Offset cancellation: Circuit methods for compensating mismatch in sensing paths to improve read reliability.

References

1. Analysis of State-of-the-Art Spin-Transfer-Torque Nonvolatile Flip-Flops Considering Restore Yield in the Near/Sub-Threshold Voltage Region. Electronics (2020).
2. Robust Offset-Cancellation Sensing-Circuit-Based Spin-Transfer-Torque Nonvolatile Flip-Flop. IEEE Access (2020).
3. Hybrid Non-Volatile Flip-Flops Using Spin-Orbit-Torque (SOT) Magnetic Tunnel Junction Devices for High Integration and Low Energy Power-Gating Applications. Electronics (2020).
4. A New Physical Design Flow for a Selective State Retention Based Approach. Journal of Low Power Electronics and Applications (2021).
5. Dynamic activation of power-gating-switch configuration for highly reliable nonvolatile large-scale integrated circuits. Japanese Journal of Applied Physics (2021).