Publication
Journal of Applied Physics
Paper

The saturation magnetostriction of thin polycrystalline films of iron, cobalt, and nickel

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Abstract

The saturation magnetostriction λs of Fe, Co, and Ni films was measured by the cantilevered substrate technique. The values of λs, -6.8×10-6 and -38×10-6, obtained for Fe and Ni, respectively, are in accord with bulk published values. A unique value of λs could not be obtained for Co because the sputtered or evaporated Co films were admixtures of face-centered-cubic and hexagonal close packed phases and the magnitude and sign of λ varied with the fcc content. Increasing the substrate temperatures during film deposition decreases the fcc content; however, this also caused the development of a C-axis hexagonal texture normal to the film plane. Annealing the films at ∼500°C caused a similar but more pronounced texture. Then, because of the uniaxial anisotropy of Co, the films could not be magnetically saturated and the magnetostrictive behavior changed; i.e., the transverse and longitudinal λ were both negative and in some instances the transverse λ was larger than the longitudinal λ.

Date

01 Dec 1982

Publication

Journal of Applied Physics

Authors

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