Researchers at the University of Tokyo have demonstrated a spintronic switching device made from Mn3Sn, an antiferromagnetic compound of manganese and tin. The device switches states in just 40 picoseconds—about 1,000 times faster than current AI accelerators—while generating minimal heat, challenging the long-standing tradeoff between speed and thermal output in silicon-based electronics. Unlike conventional semiconductors that rely on electron charge, this device leverages electron spin within a kagome lattice structure, allowing for ultrafast operation without the resistive heating that plagues high-performance computing.

The significance lies in its potential to transform data center efficiency. Cooling currently accounts for nearly 40% of data center energy use. A switching technology that avoids proportional heat generation could drastically cut both power consumption and infrastructure costs. The device uses electrical pulses to flip magnetic states and can be read via the anomalous Hall effect, all without emitting stray magnetic fields.

However, this is a proof-of-concept, not a ready-to-deploy processor. Mn3Sn does not integrate with current semiconductor fabrication processes, and building a full computing system around such components will require years of engineering. Still, the experimental validation of picosecond-scale switching without thermal penalty marks a critical milestone as silicon approaches its physical limits.