Field-dependent characteristics of equivalent circuit parameters and the magneto-impedance effect in Tb1−xDyxFe2−y/Pb(Zr,Ti)O3 laminate vibrator

Based on these researches, the magneto-impedance (MI) effect is observed in the laminate vibrator, i.e., the impedance across the electrodes of the piezoelectric layer strongly depends on DC magnetic field. Analysis shows that the MI effect is primarily attributed to the field dependence of magneto-mechanical damping in Tb1−xDyxFe2−y. The experimental results show that the maximum MI ratios up to 280% and 222.4% along with the sensitivities correspondent to DC magnetic field up to 1.71% Oe−1 and 0.8% Oe−1 are obtained at the selected operating frequencies around the frequencies of maximum and minimum impedances. The results open up possibilities for a new type of MI devices, magnetic field sensors, or multi-functional ferromagnetic/piezoelectric composite devices.