University of Tokyo researchers observe ultrafast magnetic spin switching in antiferromagnets to enhance memory technology

University of Tokyo researchers observe antiferromagnetic spins flipping in 140 picoseconds, a breakthrough for efficient next generation memory technology.

By: AXL Media

Published: Mar 5, 2026, 3:33 AM EST

Source: The information in this article was sourced from School of Science, The University of Tokyo

Exploring the Potential of Hidden Magnets

The search for faster and more efficient computing has led researchers to investigate the properties of antiferromagnets, materials where opposing electron spins cancel each other out to create a seemingly neutral magnetic state. Despite being once considered magnetically invisible, these materials are now at the forefront of memory technology. A team led by Ryo Shimano at the University of Tokyo has successfully observed the internal spin dynamics of an antiferromagnet in real time. This breakthrough, published in Nature Materials, demonstrates that the internal structure of these materials can be harnessed to represent digital information at speeds far exceeding those of traditional ferromagnetic systems.

Visualizing Sub Nanosecond Spin Flips

To observe the rapid movement of electron spins, the researchers developed a sophisticated experimental setup involving a thin film of manganese tin, or Mn3Sn. The team utilized ultrafast electrical pulses to trigger spin movements while simultaneously illuminating the sample with precisely timed flashes of light. by varying the delay between the electrical pulse and the light flash, the scientists were able to assemble a time resolved sequence of the magnetization process. This method allowed them to capture a magnetic flip occurring in just 140 picoseconds, or 140 trillionths of a second, revealing a level of detail never before achieved in the study of antiferromagnetic materials.

Identification of Two Switching Pathways

The study identified two distinct mechanisms that drive the reversal of magnetic spins. The first pathway is driven by the heat generated from high intensity electrical currents, which forces the spins to reorient. However, the second mechanism is far more significant for future technology: a non thermal pathway that flips spins directly using electrical current with minimal heat production. This efficient switching process is particularly desirable for the development of spintronic devices, as it allows for high speed data processing without the energy waste and thermal management issues that plague modern electronics.