Modern electronics power everything from smartphones to satellites, but they have significant limitations. heat. Most devices begin to fail when temperatures exceed about 200 degrees. For decades, this insulation layer has been one of the most difficult challenges in engineering.
Researchers at the University of Southern California now believe they have found a way to overcome that limit.
According to a study published on March 26, 2026. sciencea team led by Joshua Yang, the Ming Hsieh and Arthur B. Freeman Professors in the USC Viterbi School of Engineering and the USC School of Advanced Computing School of Electrical and Computer Engineering, has unveiled a new type of memory device that continues to operate at temperatures as high as 700 degrees Celsius (approximately 1,300 degrees Fahrenheit). Its temperature exceeds that of lava and far exceeds any previously achieved with this class of technology. The device showed no signs of failure. In fact, 700 degrees was simply the highest temperature the equipment could test.
“This could be called a revolution,” Yang said. “This is the highest temperature memory ever demonstrated.”
Memristor made for extreme heat
The new device is known as a memristor, a nanoscale component that can both store data and perform calculations. It is organized like a microscopic layered structure with two electrodes on each side and a thin ceramic layer between them.
Jian Zhao, lead author of the study, built the device using tungsten for the top electrode, hafnium oxide ceramic for the middle layer, and graphene for the bottom layer. Tungsten has the highest melting point of any element, while graphene, a single atom thick sheet of carbon, is known for its exceptional strength and heat resistance.
This combination created an amazing performance. The device retained data for over 50 hours at 700 degrees without refreshing. It also withstood more than 1 billion switching cycles at that temperature and operated at speeds of tens of nanoseconds at just 1.5 volts.
unexpected breakthrough
This discovery was not part of the team’s original plan. They initially tried to create another graphene-based device, but it didn’t work as intended. Along the way, they encountered something surprising.
“To be honest, like most discoveries, it was by chance,” Yang said. “Even if you could predict it, it’s usually not surprising and probably not significant enough.”
Further investigation revealed why the device performed so well. In conventional electronics, heat causes the metal atoms in the top electrode to slowly move through the ceramic layer. Eventually, they reach the bottom electrode and create a permanent connection that shorts the device and leaves it in the on state.
Graphene prevents this failure. As Yang explained, the interaction with tungsten is similar to oil and water. Tungsten atoms that approach the graphene surface cannot attach to the graphene surface. Without a stable anchorage point, they will drift without forming conductive bridges. This prevents short circuits and maintains device functionality even under extreme heat.
The researchers confirmed this mechanism using advanced electron microscopy, spectroscopy, and quantum-level simulations. By understanding what is happening with atomic interfaces, they turned an unexpected result into a principle that could guide future designs. Other materials with similar surface properties may also be identified, which could help extend the technology to industrial production.
Application in extreme environments
Electronic devices that can operate above 500 degrees Celsius have long been a goal of space exploration. For example, the surface temperature of Venus is almost at that level, and all landers sent there have failed, partly due to the extreme heat. Current silicon-based chips cannot withstand such conditions.
“It’s over 700 degrees right now and I think it’s going to get even higher,” Yang said.
Potential applications go far beyond space missions. Geothermal energy systems require electronic equipment that works deep underground, where the surrounding rock glows bright red. Fusion systems also expose equipment to high heat. Durability has been significantly improved even in daily use environments. Rated at 700 degrees, the device is extremely robust even at temperatures of around 125 degrees frequently reached inside automotive electronics.
Why is it important for artificial intelligence?
In addition to storing data, this device provides significant benefits for artificial intelligence. Many AI systems rely heavily on matrix multiplication, a mathematical operation used in tasks such as image recognition and language processing. Traditional computers perform these calculations step by step, consuming large amounts of energy.
Memristors take a different approach to the problem. By using Ohm’s law that voltage and conductance equal current, the device performs calculations directly as electricity flows. The result is obtained instantly as a measured current.
“More than 92% of the computation in an AI system like ChatGPT is nothing but matrix multiplication,” Yang said. “This type of device can do it in the most efficient way, orders of magnitude faster and with lower energy.”
Yang and the study’s three co-authors (Qiangfei Xia, Miao Hu, and Ning Ge) have already co-founded a company called TetraMem to commercialize memristor-based AI chips at room temperature. Their lab is already using TetraMem’s working chips for machine learning tasks. The high-temperature version described in this study could extend these capabilities to environments where traditional electronics cannot operate, allowing devices such as spacecraft and industrial sensors to process data directly in the field.
From laboratory prototypes to real-world technology
Despite the promising results, Yang emphasizes that there is still a long way to go before practical application. Memory is only one part of a complete computing system. High temperature logic circuits must also be developed and integrated. Additionally, current devices are built manually on a very small scale in a laboratory environment, making large-scale manufacturing time-consuming.
“This is the first step,” Yang said. “We still have a long way to go. But logic shows that it is now possible. The missing component has been created.”
From a manufacturing perspective, two materials used in the device, tungsten and hafnium oxide, are already widely used in semiconductor manufacturing. Although new, graphene is being actively developed by major companies such as TSMC and Samsung, and is already being manufactured at wafer scale in research environments.
A step towards a new frontier
The research was conducted through the CONCRETE Center (for Center for Neuromorphic Computing in Extreme Environments), a multi-university center of excellence led by USC and supported by the Air Force Office of Scientific Research and the Air Force Research Laboratory. The main experimental work was conducted in collaboration with Dr. Sabyasachi Ganguli’s team at the AFRL Materials Research Laboratory in Dayton, Ohio, and the theoretical analysis included researchers from USC and collaborators from Kumamoto University in Japan.
In the case of Yang, publications science Reflects multiple achievements.
“Space exploration has never been this real, this close, and this large scale,” he said. “This paper represents a significant leap forward into a bigger and more exciting frontier.”
