### Multilayers and perovskites rewrite rules of resistanceMultilayers and perovskites rewrite rules of resistance

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 Author Hellemans, A. Source United States Department of Energy Office of Scientific and Technical Information Content type Text Language English
 Subject Keyword PHYSICS ♦ MAGNETORESISTANCE ♦ RESEARCH PROGRAMS ♦ PEROVSKITES ♦ LAYERS Abstract In the 170 years since George Ohm identified a fundamental rule of electric current, his eponymous law has become almost as immutable as Newtons law of gravity: In a metallic conductor at normal temperatures, electric current is proportioned to the applied voltage and inversely proportional to the metals resistance. But 10 years ago, Peter Gruenberg of the Juelich Research Center in Germany investigated a metallic structure that did not appear to obey Ohm`s law. He constructed a sandwich of two iron layers separated by a thin film of chromium and found that at constant voltage he could vary the current through the sandwich simply by applying a magnetic field. The resistance of the structure could be changed with a magnetic field. This phenomenon has been exploited by high-tech companies while theorists try to future out the mechanism of magnetoresistance. This article discusses new research in the area. ISSN 00368075 Educational Use Research Learning Resource Type Article Publisher Date 1996-08-16 Publisher Place United States Journal Science Volume Number 273 Issue Number 5277