Magnetic Field Of Dreams

Albert Fert had an inkling that he was on to something big. The University mf Paris physicist knew that many metals exhibit a phenomenon called magnetoresistance (MR)--they show slight changes in electrical resistance when placed in a magnetic field. An expert in magnetism, Fert thought he could amplify the effect by designing materials made up of very thin layers of metals. In 1988, he tried--and the results were astonishing. The magnetoresistance in the material he used--chromium sandwiched between iron--was 10 times that of standard metals.

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