The Ni <sub> 0.8 </ Sub> Zn <sub> 0.2 </ Sub> Fe <sub> 2 </ Sub> The O <sub> 4 </ Sub> Complexes With Pzt Layered Magnetoelectric Effect

The magnetoelectric (ME) characterization of stickup bilayersNi_0.8Zn_0.2Fe₂O₃-Pb(Zr, Ti)O₃ and trilayers of Ni_0.8Zn_0.2Fe₂O₃ - Pb(Zr, Ti)O₃-Ni_0.8Zn_0.2Fe₂O₃ are discussed. The powder of NZFO was prepared by sol-geltechnique, then hot- pressed at 900℃, and sintered at high temperatures.The sintered temperature was increased from 950℃to 1380℃.In thesebilayers we measured strong magnetoelectric interaction and observed thetransverse ME effect was higher than the longitudinal effect by one orderin magnitude, and the ME effect tended to be stronger as the sinteredtemperature of NZFO increased. The ME interactions in the trilayers werefound much stronger than that of bilayers prepared with the same technique.The maximum transverse ME voltage coefficient of trilayer can reach 430mV cm^-1Oe^-1 under a magnetic field H=215 Oe. This value is much closerto the theoretical estimate for the ME coupling for bilayers. Thefrequency dependence ofα_E also reveals the difference of the elastic andmagnetoelectric coupling between the bilayers and trilayers. Analysissuggests that there are a more approach linear response of thepezioelectric layer to the magnetostriction of the ferrite in thetrilayers may be responsible for the significant enhanced ME effect. Weconsider that the giant ME effect observed in these trilayers origin from the hot-pressed NZFO and the preferable elastic coupling between thepezioelectric layer and the magnetostrictice layer.