〓E Effect of Nickel

概要

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The change in Young's modulus E by the magnetic field H, the 〓E effect, of Ni has been investigated in as-cold-worked and annealed states with an electrostatic driving method. The dynamic stress was measured with an interference comparametor. The results obtained are as follows : (1) The saturation value of the 〓E effect (〓E/E_0)_s is 2.1% in the as-cold-worked state and increases rapidly with annealing at 400℃ and then gradually approaches a constant value after a complicated change. (2) The E-H curve measured with a low resonance frequency shows a minimum in the weak magnetic field. The minimum decreases with increasing resonance frequency and finally vanishes. (3) The frequency dependence of the 〓E effect is most remarkable at the magnetization I/I_s=0.7〜0.6. (4) The stress dependence of E at δ=3.4 and 49.0 k dyne/cm^2 is not remarkable in any magnetized state. (5) The three types of the 〓E curve may be qualitatively explained on the assumption that the dynamic 〓E effect is a combined one of the variation in magnetostriction and the vibration.
東北大学の論文