Waste heat from tiny pulses of light can now flip magnetic data bits with 1,000 times less energy than traditional electricity.
April 29, 2026
Original Paper
Harnessing Plasmonic Heating For Switching In Antiferromagnets
arXiv · 2604.22148
The Takeaway
Antiferromagnets are great for storage because they are fast and do not interfere with each other, but they are notoriously hard to control. This method uses localized heating to switch these magnetic states without needing a bulky magnetic field. It repurposes heat, which is usually a nuisance in electronics, to do the heavy lifting. The energy required is millions of times lower than the current methods used in lab settings. This could lead to hard drives that are both incredibly fast and barely use any battery power.
From the abstract
Heat waste is a bottleneck in the development of green information technologies and much effort has been devoted to suppress the heating effect in both electronic and spintronic devices. Here we take an alternative approach and show that controllable heating at the nanoscale can actually benefit information processing. In particular, we study a hybrid nanostructure consisting of a metallic square frame and an antiferromagnetic (AFM) thin film and show that the plasmonic heating can reversibly sw