Magnetoelectric interactions in bilayers of magnetostrictive andpiezoelectric phases are mediated by mechanical deformation. Here we discussthe theory and companion data for magnetoelectric (ME) coupling atelectromechanical resonance (EMR) in a ferrite-lead zirconate titanate (PZT)bilayer. Estimated ME voltage coefficient versus frequency profiles for nickel,cobalt, or lithium ferrite and PZT reveal a giant ME effect at EMR with thehighest coupling expected for cobalt ferrite-PZT. Measurements of resonance MEcoupling have been carried out on layered and bulk composites of nickelferrite-PZT. We observe a factor of 40-600 increase in ME voltage coefficientat EMR compared to low frequency values. Theoretical ME voltage coefficientsversus frequency profiles are in excellent agreement with data. The resonanceME effect is therefore a novel tool for enhancing the field conversionefficiency in the composites.
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