'Miracle' filter turns store-bought LEDs into spintronic devices

Traditional electronics use semiconductors to transmit data through bursts of charged carriers (electrons or holes) to convey messages in "1s" and "0s." Spintronic devices can process an order of magnitude more information by assigning binary code to the orientation of electrons' magnetic poles, a property known as spin— an "up" spin is a 1, a "down" is a 0.