Abstract
The influences of the load resistance <TEX>$R_L$</TEX> on the magnetoelectric (ME) characteristics of <TEX>$NiZnFe_2O_4+PZT$</TEX> composite were investigated in the non-resonance frequency range. The ME coefficient peak increases with increasing <TEX>$R_L$</TEX>, but the frequency indicating the ME coefficient peak decreases with increasing <TEX>$R_L$</TEX>. The maximum output power peak is approximately <TEX>$9.3{\times}10^{-10}mW/Oe$</TEX> near <TEX>$R_L=3.3M{\Omega}$</TEX> at f=280 Hz, and the ME coefficient seems to be saturated at <TEX>$R_L</TEX><TEX>&</TEX><TEX>gt;20M{\Omega}$</TEX>. This frequency shift effect of <TEX>$R_L$</TEX> shows that the frequency range for an ME sensor application can be modulated with the appropriate value of <TEX>$R_L$</TEX>. The ME output voltage has a good linear response to the ac field Hac and shows fair stability over a range of temperatures. The measured non-linearity of this sample is approximately 0.8%. This sample will allow for a low-strength magnetic ac-field sensor. The result from this sample will serve as basic data for a signal-processing circuit system.
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