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Cornell researchers have demonstrated a novel method to generate localized magnetic fields using light pulses on engineered germanium metasurfaces, potentially advancing ultrafast data storage and computing architectures. By leveraging rapid changes in optical properties known as time interfaces, the study converts trapped infrared energy into stationary magnetic patterns lasting hundreds of femtoseconds. This breakthrough offers a material-agnostic pathway for manipulating magnetism without conventional magnets, which could influence future designs in high-speed information processing.