Observation of the room temperature magnetoelectric effect in Dy doped BiFeO₃

Abstract

Polycrystalline Bi(1-x)Dy(x)FeO(3) (x = 0.0, 0.03, 0.05, 0.07 and 0.1) ceramics have been prepared via a mixed oxide route. The effect of Dy substitution on the dielectric, ferroelectric, and magnetic properties of the BiFeO(3) multiferroic perovskite is studied. Experimental results suggest that in the Bi(1-x)Dy(x)FeO(3) system, increase of the Dy concentration leads to effective suppression of the spiral spin structure of BiFeO(3), resulting in the appearance of net magnetization. An anomaly in the dielectric constant (ε) was observed in the vicinity of the antiferromagnetic transition temperature. All compositions show saturated polarization-field (P-E) curves. As a result, improved multiferroic properties of Bi(0.9)Dy(0.1)FeO(3) ceramics with remnant polarization and magnetization (2P(r) and 2M(r)) of 7.98 µC cm(-2) and 0.024 emu g(-1), respectively, were established. An enhancement in remnant polarization after poling the samples in the magnetic field was evidence of magnetoelectric coupling at room temperature.