Annealing temperature effect on ferroelectric and magnetic properties in Mn-added polycrystalline BiFeO3 films

Abstract

We fabricated 5 at.% Mn-added polycrystalline BiFeO 3 films and investigated the annealing temperature effect on structural, ferroelectric and magnetic properties. In the x-ray diffraction patterns, only the diffraction peaks due to the BiFeO 3 structure were observed and no secondary phase could be observed at annealing temperatures between 773 and 923 K. Adding Mn suppressed the leakage current density in the high electric field region when compared to pure BiFeO 3 films. The conduction mechanism of the Mn-added BiFeO 3 films was dominated by Ohmic conduction. Remanent polarization of the Mn-added polycrystalline BiFeO 3 films for an applied electric field of approximately 1.5 mV/cm was 63 μC/cm 2 for the specimen annealed at 773 K and 46 μC/cm 2 for the specimen annealed at 923 K, although the remanent polarization still exhibited a tendency to increase with an increase in the electric field. Spontaneous magnetization was obtained at high annealing specimens. This study revealed that the annealing temperature strongly affected the ferroelectric and magnetic properties in Mnadded polycrystalline BiFeO 3 films. In addition, by optimizing the annealing temperature, we realized multiferroics coexistent with spontaneous magnetization and spontaneous polarization at room temperature in the Mn-added polycrystalline BiFeO 3 film.

The effects of grain size on electrical properties and domain structure of BiFeO3 thin films by sol–gel method

“…and volatilization of Bi [12]. In general, the concentration of oxygen vacancy in BFO thin films increases with the rise of annealing temperature so that the leakage current increases [37,38]. It is not consistent with our results.…”

Evaluation of Electrical Properties of Leaky BiFeO3Films in High Electric Field Region by High-Speed Positive-Up–Negative-Down Measurement

“…Many studies attempted to decrease the leakage current in BiFeO 3 films by adding appropriate additives and refining the preparation conditions. [1][2][3][4][5] It is useful to know the J-E properties of such leaky specimens in a high electric field region for investigating the conduction mechanism and obtaining the guidelines to reduce the leakage current.…”

Optimizing phase formation of BiFeO3 and Mn-doped BiFeO3 nanoceramics via thermal treatment using citrate precursor method

“…Amongst the several multiferroic materials, BiFeO 3 (BFO) is probably the only lead-free multiferroic material showing room temperature ferroelectric and G-type anti-ferromagnetic orders simultaneously. Rhombohedrally distorted perovskite (ABO 3 ) structured BFO, with R3c space group shows high anti-ferromagnetic Neel temperature, (T N ~ 370 °C) and high ferroelectric temperature (T C ~ 830 °C) [5,6]. The anti-ferromagnetic nature in BFO arises due to partially filled d-orbitals of Fe 3+ at B site, and ferroelectric order develops due to the presence of 6s 2 lone pair of electrons of Bi 3+ at A site [7].…”

“…Chandel et al reported enhanced electrical and magnetic properties in Mn-doped BFO nanoparticles [22]. Hiroshi et al investigated the impact of annealing temperature on Mn-doped BFO films [6]. The effect of Mn-doping concentration on the multiferroicity of BFO was investigated by Chauhan et al [5].…”