Abstract
In this letter, characteristics of the electric power generation in the multi-ferroic composites, composed of the ferromagnetic Fe_<70>Pd_<30> alloy (thickness of 90 μrn) with large magnetostriction and ferroelectric PZT (260 μm), were investigated at the point of view of the possibility for applying to micro-passive devices. The three-layered Fe_<70>Pd_<30>/PZT (C-3)/Fe_<70>Pd_<30> composite exhibits high magneto-electric-voltage (V_p) of about 0.7 V/Oe by the driving external AC magnetic field (H_<AC>) of 1 Oe at a resonant frequency (f_r) of 62 kHz. The improvement in the magneto-electric-voltage might be originated from a simultaneous effect of higher piezoelectric voltage constants (g_<33>) and lower relative dielectric constant (ε_<33>^T/ε_0). Moreover, output on the five-layered composite, i.e. (Fe_<70>Pd_<30> x 2)/PZT (C-62)/(Fe_<70>Pd_<30> x 2) composite reaches about 160 μW/Oe by the H_<AC> of 1 Oe at f_r, which is equivalent to 1.39 mW/cm^3 in the harvesting power density. The power remarkably increases with the number of Fe-Pd layer.
