Abstract
We have investigated the magnetoelastic response of a series of Cu/Co/Cu/Fe multilayer films to applied stress by observing changes in the spin-valve magnetoresistance. The films were prepared by dc magnetron sputtering onto glass or polyimide substrates with individual layer thicknesses ranging from 35 to 50 Å. The typical magnetoresistance without external stress is about 1.2%. The strain induced by the applied stress varies from + 1600 (tension) to −1300 (compression) parts per million. We observed a decrease (increase) of coercivity with compressive (tensile) strain for both Fe and Co. This indicates that in the film plane, Fe and Co films have the same positive sign of magnetostriction. The observed coercivity change is about ±10 Oe for the maximum applied strain in both cases. The resulting maximum change in Δ R/R with a 1% strain is about −0.018 (+0.012) at the coercive field of Fe (Co).
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