  The structural, dielectric, magnetic, and magnetoelectric (ME) properties of
particulate composites containing lead-iron niobate and lead titanate
piezoelectric 0.94[PbFe$_{0.5}$Nb$_{0.5}$O$_3$]-0.06[PbTi$_{0.5}$O$_3$]
(PFN-PT) and Zn-substituted cobalt ferrite magnetostrictive
CoFe$_{2-x}$Zn$_{x}$O$_4$ (CF$_{2-x}$Z$_{x}$O);
0.6(PFN-PT)/0.4(CF$_{2-x}$Z$_{x}$O), x=0, 0.025, 0.1, 0.2, 0.3 (with ratio of
60 Wt\% ferroelectric and 40 Wt\% ferrite); have been investigated. We
investigated the ME voltage coefficient as a complex quantity for all composite
samples using the dynamic piezomagnetic coefficient, $q^{ac}$=$\partial
\lambda^{ac}/{\partial H}$. The results reveal that tuning the magnetostrictive
phase has a strong effect on the real part of the ME voltage coefficient.
Doping zinc into cobalt ferrite modified the magnetic properties of the
magnetic phase, such as magnetic anisotropy and coercive field, and hence the
ME properties. The highest ME coefficient value of 12.33 $\frac{mV}{cm. Oe}$
was obtained for x=0.1 at the magnetic field of 755 Oe. In addition, the
magnetic field at which the maximum value of the ME coefficient was observed
($H_{peak}$) strongly depends on the value of Zn substitution. The results were
interpreted using the magnetic field dependence of the CF$_{2-x}$Z$_{x}$O
magnetostriction.
