Magnetic Tunnel Junction (image) University of Miami Caption The top is a graphic representation of the overall device structure. The diameter is roughly that of a human hair. The bottom is a magnified image of the central part. The white spots are atoms and the white circles are the nano-magnets, the "working part" of the device. Credit Pham Nam Hai Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.