Buckyballs turn on copper’s magnetism
Layers of carbon-atom cages steal electrons from certain metals, making them magnetic

MAGNETS-IN-WAITING Copper (left) and manganese are typically nonmagnetic, like nearly every other element on the periodic table. But expose the metals to buckyballs and they become magnetized.
Jonathan Zander/Wikimedia Commons (CC BY-SA 2.5); Tomihahndorf/Wikimedia Commons (CC BY-SA 3.0)