The first mechanism for switching superconductivity completely on or off in a magnetic device, drastically reducing energy consumption

https://www.eurekalert.org/news-releases/1095776

"De Gennes' superconducting switch: superconductor sandwiched between ferromagnetic insulators, net magnetic exchange field controlled through ferromagnetic layers' magnetic orientation... shifts in superconducting critical temperature lower than predicted so superconductivity not completely suppressed, overcome using: europium sulfide insulating ferromagnet, niobium superconductor, additional gold layer in-between boosting induced large proximity exchange field... non-volatile superconducting RAM"