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Science 20 August 1993:
Vol. 261. no. 5124, pp. 1021 - 1024
DOI: 10.1126/science.261.5124.1021
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Articles

Giant Magnetoresistance at Low Fields in Discontinuous NiFe-Ag Multilayer Thin Films

T. L. Hylton 1, K. R. Coffey 1, M. A. Parker 1, and J. K. Howard 1

1 IBM ADSTAR, San Jose, CA 95193

A series of sputtered multilayers of Ni80Fe20-Ag was prepared to examine the giant magnetoresistance effect before and after annealing. For a wide range of NiFe and Ag thicknesses, no giant magnetoresistance was observed in the unannealed films. After annealing, a large, negative magnetoresistance was observed of order 4 to 6% in applied fields of order 5 to 10 oersteds at room temperature. The appearance of giant managetoresistance is concurrent with the breakup of the NiFe layers, which is attributable to a magnetostatic interaction that favors local antiparallel alignment of the moments in adjacent layers. These structures may be of significant practical importance as sensors that require large changes in resistance at low fields, such as magnetoresistive heads used in magnetic recording systems.

Submitted on May 17, 1993
Accepted on July 7, 1993


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Magnetic Films Get Sensitivity Training.
R. Pool (1993)
Science 261, 984
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Science. ISSN 0036-8075 (print), 1095-9203 (online)