Abstract
The maximum transverse magnetoelectric (ME) voltage coefficient αE31∼235mV/cmOe and maximum longitudinal ME voltage coefficient αE33∼148mV/cmOe were obtained in co-fired PbZr0.52Ti0.48O3–Co0.6Zn0.4Mn0.3Fe1.7O4 (PZT–CZFMO) bilayer composite (optimum thickness ratio tPZT/tCZFMO∼1:3) at H=700Oe with an applied ac magnetic field of frequency=1kHz. Interestingly, at the lowest frequency of measurement f=100Hz, a giant value of αE31∼16.9V/cmOe was observed for this bilayer system that is orders of magnitude higher than the reported αE values (∼200–300mV/cmOe) for PZT–CFO composite structures at low frequencies. Better magneto-mechanical coupling resulting from the simultaneous substitution of both Mn and Zn in CFO along with the optimum thickness ratio of two layers must be the cause of substantial ME coupling in the PZT–CZFMO bilayer system. In addition, the dielectric constant spectra of bilayer revealed very high thickness resonance frequency∼85MHz and band width ∼14MHz.
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