Thumbnail
Access Restriction
Open

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 Newton`s law of gravity: In a metallic conductor at normal temperatures, electric current is proportioned to the applied voltage and inversely proportional to the metal`s 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


Open content in new tab

   Open content in new tab