Bar-shaped Magnetoelectric Gyrator

This paper reports a dual-resonance power transfer effect and a dual-resonance I-V conversion for a bar-shaped ME gyrator made from a hard Pb(ZrxTi1−x)O3 (PZT) ceramic bar having a transverse polarization and a Tb0.3Dy0.7Fe1.92 (Terfenol-D) magnetostrictive alloy bar having a longitudinal magnetization bonded along their cross-section areas. A bar-shaped provides several advantages to a ME gyrator; such as dual resonance frequency along its length direction, as well as half-wave and full-wave vibration modes; reduced laminate bonding area avoiding adhesive breakdown; and ease of fabrication. The reported magnetoelectric gyrator effect originates from the mechanically mediated resonance piezoelectric and magnetostrictive effects in the PZT and Terfenol-D bars, respectively. We studied the influence of the length ratio between the Terfenol-D and piezoelectric bars. A power efficiency of 69.4% was obtained at the half wavelength resonance of 21.47kHz under optimal H Bias=1000 Oe and low power conditions. Under higher power drive of 8W/in3, an efficiency of 60.2% was found. This dual-resonance ME gyrator effect offers much promise in power transfer devices for power electronic applications.