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Cornell researchers have demonstrated a method to generate static magnetic fields at the nanoscale by converting light energy into lasting magnetization without traditional magnets or magnetic materials. This breakthrough utilizes localized free carrier generation in a germanium metasurface to sustain current loops for approximately 300 femtoseconds, offering a novel pathway for spintronics and computing applications. The technique fundamentally alters how magnetic fields are manipulated at the nanoscale by leveraging optical properties rather than external magnetic sources.