Scientists capture a magnetic flip in 140 trillionths of a second

Scientists at the University of Tokyo have captured something never seen before: a frame-by-frame view of how electron spins flip inside an antiferromagnet, a material once thought to be magnetically “invisible.” By firing ultrafast electrical pulses into a thin layer of manganese–tin and tracking the response with precisely timed flashes of light, the team uncovered two distinct switching mechanisms. One relies on heat generated by strong currents, while the other flips spins directly with minimal heating — a far more efficient process. From punched paper cards and metal rods to vacuum tubes and transistors, modern computing has always relied on physical systems to represent 0s and 1s. As demand for processing power continues to rise, researchers are searching for faster and more ef... [3087 chars]