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We report the use of high magnetomechanical coupling ferrites inmagnetoelectric (ME) layered composites. Bilayer samples combining $(Ni_{0.973}Co_{0.027})_{1-x} Zn_x Fe_2 O_4$ ferrites ($x = 0-0.5$) synthesized by nonconventional reactive Spark Plasma Sintering and commercial lead zirconatetitanate (PZT) were characterized in term of ME voltage coefficients measuredat sub-resonant frequency. Strong ME effects are obtained and we show that anannealing at 1000$^\circ$C and a quenching in air improve the piezomagneticbehavior of Zn-rich compositions. A theoretical model that predicts the MEbehavior was developed, focusing our work on the demagnetizing effects in thetransversal mode as well as the longitudinal mode. The model shows that: (i)high ME coefficients are obtained when ferrites with high magnetomechanicalcoupling are used in bilayer ME composites, (ii) the ME behavior in transversaland longitudinal modes is quite similar, and differences in the shapes of theME curves are mainly due the demagnetizing effects, (iii) in the transversalmode, the magnetic field penetration depends on the ferrite layer thickness andthe ME coefficient is affected accordingly. The two later points are confirmedby measurements on ME samples and calculations. Performances of the MEcomposites made with high magnetomechanical coupling ferrites are compared tothose obtained using Terfenol-D materials in the same conditions of size,shape, and volume ratio. It appears that a ferrite with an optimizedcomposition has performances comparable to those obtained with Terfenol-Dmaterial. Nevertheless, the fabrication processes of ferrites are quitesimpler. Finally, a ferrite/PZT based ME composite was used as a currentsensor.

Magnetoelectric effect in layered ferrite/PZT composites. Study of the demagnetizing effect on the magnetoelectric behavior