Multiferroic perovskite (Pb0.845Sm0.08Fe0.035)(Ti0.98Mn0.02)O3 with ferroelectric and weak ferromagnetic properties

Abstract

We have investigated the multiferroic properties of PbTiO3 substituted on the A-site with Sm3+ and Fe2+ magnetic ions. We show that the ceramic material with composition (Pb0.845Sm0.08Fe0.035)(Ti0.98Mn0.02)O3 has a spontaneous ferroelectric polarization of about 14 μC/cm2 and weak ferromagnetism (remanent magnetization ∼2.3 emu/g) which persists even at room temperature. The dielectric constant is 190, tan δ ∼ 0.005, and the piezoelectric g33 constant is 25 mV × m/N. Temperature dependence of dielectric permittivity shows a strong anomaly at 662 K, at the paraelectric-ferroelectric transition, and a broader anomaly below 140 K where magnetization also increases, probably due to magnetoelectric coupling between ferroelectric and magnetic states.