THE INITIAL MAGNETIZATION OF NICKEL UNDER TENSION

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Abstract
In an attempt to resolve apparent discrepancies in the literature the initial susceptibility (χ) and Rayleigh constant (a) of pure nickel wire were measured between room temperature and the Curie point under various tensions (Z). For annealed nickel the quantity χZ is independent of Z, as required by Becker's theory, if the stresses are applied in order of increasing magnitude and if no plastic deformation occurs. χ and a are found to be connected by Néel's relation a = c χ2J0/Js. The same temperature dependence is shown by χZ as by the initial susceptibility of unstressed nickel given in the literature. At temperatures below 150 °C. the temperature dependence of χZ is consistent with the recent theory of Döring. At higher temperatures χZ increases monotonically to the Curie point but at a smaller rate than Döring's low temperature theory predicts. This temperature dependence is in apparent conflict with Becker's theory and magnetostriction measurements of Döring and Kirkham. It is possible, but unlikely, that the conftict arises from the presence of textures in the various specimens. An appendix gives the textures of the wire specimens as found by neutron diffraction.
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