# ETH Zurich

Laser Pulses Flip Magnet Polarity, Opening Path to Tunable Optoelectronics

Swiss researchers reported in Nature that laser pulses can reverse the polarity of a specialised ferromagnet, demonstrating all‑optical control beyond ferrimagnetic materials. The finding points to faster, potentially lower‑energy ways to program magnetic states, with implications for memory, spintronics and reconfigurable optoelectronic circuits, though engineering challenges remain.