Load Resistance Influence of Magnetoelectric Characteristics on NiZnFe₂O₄+PZT Composites for Magnetoelectric Sensors

Abstract

The influences of the load resistance R L on the magnetoelectric (ME) characteristics of NiZnFe 2 O 4 +PZT composite were investigated in the non-resonance frequency range. The ME coefficient peak increases with increasing R L , but the frequency indicating the ME coefficient peak decreases with increasing R L . The maximum output power peak is approximately 9.3×10 -10 mW/Oe near R L =3.3 MΩ at f=280 Hz, and the ME coefficient seems to be saturated at R L >20 MΩ. This frequency shift effect of R L shows that the frequency range for an ME sensor application can be modulated with the appropriate value of R L . 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.