A collaborative research team from Tohoku University and Japan's National Institute for Materials Science has made significant progress in the field of antiferromagnetic memory. The team fabricated nanoscale devices using the chiral antiferromagnetic material Mn3Sn, achieving gigahertz high-speed memory operation for the first time without the need for an external magnetic field. The research results have been published in the journal Science.

The experiment employed a current-induced coherent rotation of the antiferromagnetic structure, successfully realizing efficient switching with 0.1-nanosecond current pulses. This switching speed surpasses all ferromagnetic memory devices and maintained a zero-error record over a thousand test cycles. Researcher Yutaro Takeuchi said: "Achieving a thousand error-free switches with 0.1-nanosecond current pulses in a zero magnetic field environment is a performance metric that ferromagnetic materials cannot reach."

Theoretical analysis shows that the advantage of antiferromagnets stems from their unique two-dimensional rotation mechanism. Unlike the three-dimensional precessional motion of traditional ferromagnets, the chiral spin structure achieves more stable switching dynamics through effective inertial mass. Project leader Shunsuke Fukami emphasized: "This study is the first to demonstrate that antiferromagnets can achieve functions that ferromagnets cannot."

This breakthrough opens a new path for next-generation semiconductor memory technology. By eliminating the need for an external magnetic field and achieving ultra-low power switching, antiferromagnetic memory is expected to drive the development of high-performance computing devices. The researchers stated that this technology can be applied in the future to spintronic memory and logic devices.