Abstract
The dynamic magnetostrictive properties of Ni-Fe alloys containing from 35.0 to 70% nickel were investigated to determine their suitability for use in electromechanical transducers. The material, in the form of toroids made from ring laminations, was evaluated by the motional impedance method. The annealing temperature was varied from 900°C to 1220°C. Also the effect of magnetic annealing was considered. Measured values of the electromechanical coupling coefficient, the mechanical Q in air, the reversible permeability, the dynamic magnetostrictive constant, and other parameters are given. A maximum electromechanical coupling coefficient of approximately 0.37 was obtained for 40 Permalloy annealed at 1000°C. The electrical resistivity and saturation flux density of 40 Permalloy exceeded that of nickel by factors of 6 and 2.5, respectively.
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