Signal Control Without Thermal Overhead
August 12, 10:30 AM
Altermagnets, a relatively new class of magnetic materials, appear to combine desirable features of ferromagnets and antiferromagnets. Now researchers at Rice University have taken one such material, manganese telluride, and used uniaxial stretching to align it into a single magnetic domain. In that state, the material's anomalous Hall effect—the appearance of a transverse voltage when an electric current passes through—could be switched in polarity at around 230 kelvin (about -43.15°C). This demonstrates a way to control the material's electronic response without raising its temperature.
Key Findings and Broader Impact
Manganese telluride tends to form many magnetic domains, making its magnetic structure difficult to characterize. Stretching the material along one axis eliminated that ambiguity, allowing the team to observe the anomalous Hall effect clearly. Notably, a 1% change in strain produced a change in behavior equivalent to a temperature shift of roughly 150 kelvin—so strain offers an unusually strong tuning mechanism.
The switch in behavior can be understood through changes in the Berry curvature, a geometric property that influences how electrons move through the material. Because altermagnetism may offer advantages over conventional ferromagnets and antiferromagnets, this work points toward electronic devices that run faster and generate less heat. The results were published in Physical Review X.
Altermagnets are increasingly seen as candidates for future electronics, where signals could be controlled efficiently without thermal cycling. The Rice University findings suggest that strain-based manipulation could become a practical route for developing low-power, high-performance devices, including systems that operate at cryogenic temperatures. That direction may ultimately reduce energy consumption and support more sustainable electronics.
As researchers continue to explore innovative materials, the recent achievement of record-high temperatures for superconductivity highlights the rapid advancements in this field. These breakthroughs not only push the boundaries of what is possible but also pave the way for practical applications in electronics. To learn more about this significant development, check out the article on record-breaking superconductivity.