Dimension effects of a magnetoelectric gyrator with FeCoSiB/Pb(Zr,Ti)O3 layered composites core for efficient power conversion.

Current-to-voltage conversion ratio (a) as a function of the magnetic bias, (b) as a function of the load resistor and (c) as a function of the power density. Input and output power levels (d) as a function of the magnetic bias, (e) as a function of the load resistor and (f) as a function of the power density. Power efficiency (g) as a function of the magnetic bias, (h) as a function of the load resistor and (i) as a function of the power density. • Achievement of a power efficiency of 95% in FeCoSiB/PZT magnetoelectric gyrators. • Measured magnetoelectric coefficient of 2200 (V/cm)/Oe at resonance; measured magnetoelectric charge coefficient of 32 (mC/cm2)/Oe at resonance; measured open loop current-to-voltage ratio of 50–60 kV/A at resonance. • Enlarged sizes increasing the magnetomechanical coupling factor between FeCoSiB layers and the coil in accordance with theoretical approaches. A Magneto-Electric (ME) gyrator with a superior power efficiency of 95 % has been achieved based on a two-phase solid-state ME laminate. This ME gyrator consists of a winding coil that generates a magnetic field as the first step to realize electromagnetic energy transfer. A magneto-electric composite, serving as the second step, then converts the power from magnetic to electric forms. The laminate consists of two iron-cobalt based amorphous alloy layers bonded to a lead zirconate titanate plate. It has a giant magneto-electric coefficient of around 2200 (V/cm)/Oe at its mechanical resonant frequency (≈ 44 kHz) in structure. Approaching methods based on maximum power transfer (MPT) efficiency theory and the equivalent loss factor (ELF) from the input port have been introduced to evaluate the power efficiency of the ME gyrator. The expected MPT efficiency is 96.5 % at a power volume density of 0.1 W/in3 (6.1 mWatt/cm3), and 93.2 % up to 20 W/in3 (1.22 W/cm3). The ELF explains that the magnetomechanical conversion efficiency is related to the volume of the magnetic phase which is the dominating term in the power efficiency. [ABSTRACT FROM AUTHOR]