This memory chip works at 700 degrees Celsius. The startup behind it is already building AI chips that compute where GPUs cannot.

TetraMem memristor survives 700 degrees Celsius as startup moves AI inference chips to production wafers

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This memory chip works at 700 degrees Celsius. The startup behind it is already building AI chips that compute where GPUs cannot.

May 14, 2026 – 8:20 am

Image by: TetraMem

TL;DR

USC researchers built a memristor that operates at 700 degrees Celsius—hotter than molten lava and far beyond Venus’ surface temperatures—while TetraMem, the startup commercializing the technology, has already moved its room-temperature AI inference chips to 300mm production wafers with SK hynix and CHIPS Act support.

Every probe humanity has sent to Venus has died. The Soviet Venera landers survived between 23 minutes and two hours on a surface where the temperature exceeds 460 degrees Celsius. Their electronics, designed to endure heat that would melt lead, still failed. The longest-lived mission in the history of Venus exploration lasted 127 minutes. Then the chips stopped working and the data stopped flowing.

A team at the University of Southern California has built a memristor that operates reliably at 700 degrees Celsius, hotter than molten lava, and more than 200 degrees beyond anything Venus could throw at it. The device, published in Science on March 26, 2026, held data for more than 50 hours at that temperature without refresh, survived more than one billion switching cycles, and ran on 1.5 volts with a switching speed measured in tens of nanoseconds. Seven hundred degrees was not the device’s limit; it was the limit of the testing equipment.

The Device

A memristor is a nanoscale component that stores information and performs computation simultaneously. The device that Joshua Yang’s team built at USC consists of three layers: tungsten on top, hafnium oxide ceramic in the middle, and a single-atom-thick sheet of graphene on the bottom. Tungsten has the highest melting point of any metal. Hafnium oxide is a standard insulator in semiconductor fabrication. Graphene is a form of carbon that, like diamond, withstands enormous heat without degrading.

In conventional memory devices, heat causes metal atoms from the top electrode to migrate through the ceramic layer until they reach the bottom electrode, creating a permanent short circuit that kills the device. Graphene prevents this. Its surface chemistry with tungsten is, as Yang put it, almost like oil and water. The tungsten atoms find nothing to anchor them and migrate away. No anchor, no short circuit, no failure.

The team did not merely observe the effect. Using electron microscopy, spectroscopy, and quantum-level computer simulations, they mapped the atomic interface between graphene and tungsten to understand exactly why it works. That mechanistic understanding means other materials with similar surface chemistry can now be identified, potentially making the device easier to manufacture.