Multiferroic and Magnetodielectric Effects in Multiferroic Pr2FeAlO6 Double Perovskite

Abstract

Single-phase multiferroics that allow the coexistence of ferroelectric and magnetic ordering above room temperature are highly desirable, and offer a fundamental platform for novel functionality. In this work, a double perovskite multiferroic Pr2FeAlO6 ceramic is prepared using a sol-gel process followed by a quenching treatment. The well-crystallized and purified Pr2FeAlO6 in trigonal structure with space group R3c is confirmed. A combination of the ferroelectric (2Pr = 0.84 μC/cm2, Ec = 7.78 kV/cm at an applied electric field of 20 kV/cm) and magnetic (2Mr = 433 memu/g, Hc = 3.3 kOe at an applied magnetic field of 1.0 T) hysteresis loops reveals the room-temperature multiferroic properties. Further, the magnetoelectric effect is observed from the measurements of magnetically induced dielectric response and polarization. The present results suggest a new complex oxide candidate for room-temperature multiferroic applications.

Structural, magnetic, magnetocaloric behavior and magneto-transport, electrical polarization study in 3d based bulk and nano-crystalline multiferroic double perovskite Dy2MnCoO6

“…Here, the reduction of the hysteresis phenomena was observed in the presence of external magnetic field because the field increases the pinning of the ferroelectric domains (shown in figure 9(b)). A similar behavior of the decrease of electrical polarization under the application of an applied magnetic field has been observed in several reports [10,75,78] P(E) hysteresis loops of the bulk and nano systems measured at 115 K for various electric fields are presented in figures 10(a) and (b). We clearly observe that both P r and P max values increases with the increase of electric field and these results can be found by the polarization mechanism of the ferroelectric materials.…”

“…[76,77] Moreover, the hysteresis loop in figure 9(a) shows the variation of Polarization with external electric field for bulk and nanocrystalline compounds at T = 125 K under 50 kV cm −1 external electric field. In case of FE materials, grain size affects P r and P max values through the effect of grain boundaries and domain orientation [10,76]. The specific influence of grain size effect is that P r and P max value increases and the ferroelectricity in the nano system is enhanced compared to the bulk system.…”

“…In most of the cases, these compounds crystallize in orthorhombic structure (with space group Pbnm) for disordered state or in monoclinic structure (with space group P2 1 /n) for ordered state. However, few other space group symmetry also reported for several double perovskite systems [9,10]. Nowadays, a special type of double perovskite materials R 2 BMnO 6 (B = Co or Ni) has attracted much attention due to the multivalent state of Mn ions (Mn 2+ , Mn 3+ , Mn 4+ ), which exhibit a complicated interplay between magnetic and electric properties [3,11,12].…”