Researchers have developed a way to sculpt three-dimensional nanoscale devices directly from single crystals. Using a focused ion beam, they carved microscopic helical structures from a magnetic crystal (Co₃Sn₂S₂). These tiny helices act as switchable diodes, letting current flow more easily in one direction, and the direction can be flipped by changing the magnetization or the helix’s twist. The findings demonstrate that a device’s geometry alone can control electrical behavior, opening new possibilities for low-power memory, logic, and sensing technologies.
