Study of dielectric, magnetic, ferroelectric and magnetoelectric properties in the PbMn(x)Ti(1-x)O(3) system at room temperature.

We report magnetoelectric coupling at room temperature between ferroelectric and magnetic order parameters in Mn-doped PbTiO(3) compounds prepared by a solid-state reaction method. X-ray diffraction showed that PbMn(x)Ti(1-x)O(3) (x = 0.1, 0.3 and 0.5) compounds were single phase. The Mn substitution reduced the lattice distortion, i.e., the c/a ratio, and hence the ferroelectric Curie temperature (T(C)) decreased with increasing Mn content. High-temperature magnetization measurements showed that the ferromagnetic Curie temperature (T(M)) decreases with increasing Mn in PbMn(x)Ti(1-x)O(3). An anomaly in the dielectric constant (ε) was observed in the vicinity of the ferromagnetic transition temperature. These samples exhibited magnetism and ferroelectricity simultaneously at room temperature, which was evidenced from the coexistence of saturated magnetization and polarization hysteresis loops. An enhancement in saturation polarization after poling the samples in the magnetic field was evidence of magnetoelectric coupling at room temperature. An enhancement of 11-13% in polarization was observed after poling the samples in a magnetic field at 1.2 T.