Spin Valve (IMAGE) Johannes Gutenberg Universitaet Mainz Caption Depending on the magnetic configuration of the spin valve, the electrical signal is transmitted (bottom) or suppressed (top). Credit Joel Cramer Usage Restrictions None License Licensed content 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.