Lava‑proof graphene memristor keeps data intact at 700 °C

Most commercial electronics begin to fail when pushed past roughly 200 °C, which has long limited systems for applications such as Venus landers, deep‑earth geothermal drilling, and nuclear or fusion energy environments. In this context, a non‑volatile memory technology that can operate stably at 700 °C marks a major advance for extreme‑environment electronics. The new device is a memristor, a nanoscale two‑terminal component that stores information and can perform computing operations. It is built as a tiny sandwich: a tungsten top electrode, a hafnium oxide (HfOx) switching layer, and a one‑atom‑thick graphene bottom electrode. All three materials can withstand very high temperatures without structural breakdown, enabling robust operation in regimes far beyond conventional silicon‑based chips.

Researchers at University of Southern California, Airforce Research Lab/RX, Kumamoto University and TetraMem have demonstrated graphene-based memristors that remain reliable at temperatures where conventional electronics fail. Their Gra/HfOx/tungsten (W) devices operate up to 700 °C with an ON/OFF current ratio greater than 103, data retention beyond 50 hours, and endurance exceeding 109 switching cycles, while switching in tens of nanoseconds at about 1.5 V. At 700 °C the devices showed no intrinsic limit; the maximum temperature was set by the test equipment.Most commercial electronics begin to fail when pushed past roughly 200 °C, which has long limited systems for applications such as Venus landers, deep‑earth geothermal drilling, and nuclear or fusion energy environments. In this context, a non‑volatile memory technology that can operate stably at 700 °C marks a major advance for extreme‑environment electronics. The new device is a memristor, a nanoscale two‑terminal component that stores information and can perform computing operations. It is built as a tiny sandwich: a tungsten top electrode, a hafnium oxide (HfOx) switching layer, and a one‑atom‑thick graphene bottom electrode. All three materials can withstand very high temperatures without structural breakdown, enabling robust operation in regimes far beyond conventional silicon‑based chips.

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