Allen Pan created a giant hammer that only he can lift, so long as the hammer is on a metal surface. The electromagnet creates a very strong magnetic field, strong enough to make the hammer feel too heavy to lift. Pan made the fingerprint sensor act as a switch, so when he grabs the hammer’s handle and places his thumb on the sensor, the electromagnets turn off, allowing only him to lift the hammer. The only guy who finally lifted the hammer was him.
Source: https://thehackernews.com/2015/10/electromagnetic-thor-hammer.html