Magnetoelectric transducer of ferromagnetic alloy with constant elasticity and piezoelectric ceramic for wireless power transmission

Magnetostrictive properties in a type of iron-nickel-based ferromagnetic alloy with constant elasticity (FeNi-FACE) are investigated. The results indicate that the strain coefficient at resonance achieves 865.70 nm/A due to the high effective mechanical quality factor (~3000) of the alloy. A magnetoelectric (ME) transducer with high effective mechanical quality factor is developed, which employs the FeNi-FACE and piezoelectric Pb(Zr,Ti)O₃ (PZT8) material. The transducer is designed to operate as a half-wavelength (lambda/2), longitudinal resonator. Resonance of the transducer occurs at the frequency of 29.9674 kHz, and the resonant ME voltage coefficient achieves 35.707 V/Oe (i.e., 446.338 V/cm Oe) with an effective mechanical quality factor of 1450. The ME output power density at optimal load resistance of 35 kOmega arrives 0.989 mW/cm³ under 0.3 Oe root-mean-square AC magnetic field. The performances indicate that the ME transducer is promising for ME energy conversion application.