Abstract
Ferroelectric, magnetic, and magnetoelectric effects for lanthanum modified BiFeO₃-xPbTiO₃ ceramics have been investigated. The data show that magnetoelectric polarization coefficient ,αP is due to a linear coupling between polarization and magnetization, and that αP is independent of dc magnetic bias and ac magnetic field. The values of αP and magnetic induced susceptibility for lanthanum modified BiFeO₃-xPbTiO₃ ceramics are much larger than those of single BiFeO₃ crystal. We believe that the magnetoelectric effect is significantly enhanced by breaking of the cycloidal spin state of a long-period spiral spin structure due to randomly distributed charged imperfections.
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