Lava‑proof graphene memristor keeps data intact at 700 °C
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.
Source: https://www.graphene-info.com/lava-proof-graphene-memristor-keeps-data-intact-700-c
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