Observation of saturated polarization and dielectric anomaly in magnetoelectric BiFeO3 thin films

We report here synthesis of phase-pure magnetoelectric ${\mathrm{BiFeO}}_3$ thin films with controlled oxygen stoichiometry on $\mathrm{Pt}/{\mathrm{TiO}}_2/{\mathrm{SiO}}_2/\mathrm{Si}$ substrate using pulsed-laser deposition technique. Saturated ferroelectric hysteresis loop has been observed in phase-pure and highly resistive ${\mathrm{BiFeO}}_3$ thin films. The dielectric response study of the films with temperature indicates an anomaly in dielectric constant $\mathrm{\epsilon (T),}$ in the vicinity of Néel temperature (∼380 °C). This anomaly in $\mathrm{\epsilon (T)}$ is explained as an influence of vanishing magnetic ordering on electric ordering of magnetoelectric ${\mathrm{BiFeO}}_3$ sample.