A new method of magnetostrictivity and magnetostriction measurement

The magnetostrictivity (d) and magnetostriction (λ) of high coupling magnetomechanical amorphous ribbons and wires are determined without the use of a direct magnetomechanical measurement. The method relies on an easily measured magnetic property (permeability) of the magnetostrictive material obtained under the conditions of constant stress and constant strain (μ^c). The magnetomechanical nature of the measurement enters through μ^c. Experimental results are compared to predictions made on the basis of the single-vector magnetization rotation model. The effect of demagnetization on the magnetostrictivity and coupling factor is also calculated for long thin ribbons and wires