Magnetoelectric properties of zinc-substituted BiFeO$_3$ multiferroics

The magnetoelectric properties of ceramic samples of BiFe$_{1-x}$Zn$_{x}$O$_{3}$ and Bi$_{1-x}$Zn$_{x}$Fe$_{1-x}$Zn$_{x}$O$_{3}$ multiferroics have been studied in magnetic fields from 0 to 80 kOe at room temperature. All the samples have the linear dependences of magnetoelectric coefficient $\alpha_{\mathrm{ME}}$ with low hump-like maxima of $\alpha_{\mathrm{ME}}$ at 10 kHz and also at 85 kHz. These magnetoelectric studies of the bismuth ferrites with doubly substituted Zn show that the double substitution of Zn$^{2+}$ ions for Bi$^{3+}$ and Fe$^{3+}$ ions does not lead to desired enhancement of the magnetoelectric properties as compared with the ordinary substitution of Zn$^{2+}$.