Magnetic and dielectric properties of Eu-doped BiFeO3 nanoparticles by acetic acid-assisted sol-gel method

Abstract

The BiFeO3 nanoparticles, having an average size of 13 nm, were synthesized by a simple sol-gel method. The samples possess single phase up to 2% Eu doping at the Bi site. The uncompensated spin moments on the surface and the modification of cycloidal spin structure due to the small size (13 nm) result in a ferromagnetic phase of the BiFeO3 nanoparticles. The successful doping of magnetically active Eu3+ ions in BiFeO3 nanoparticles improves the ferromagnetic property. The similar dependency of saturation magnetization, coercive field, and dielectric constant on Eu doping concentration reveals that a correlation between magnetic and dielectric properties exists in Eu-doped BiFeO3 nanoparticles.

Influence of Eu substitution on structural, magnetic, optical and dielectric properties of BiFeO3 multiferroic ceramics

“…The appearance of the relaxation peak in dielectric loss ( Fig. 8) at higher frequencies for x¼ 0.03 and 0.05 samples can be associated to the strong correlation existing between the conduction mechanism and dielectric polarization of the samples [43]. This relaxation peak is suppressed for x40.05 samples.…”

Improved multiferroic properties in (Ho, Mn) co-doped BiFeO3 thin films prepared by chemical solution deposition

“…Perovskite-based bismuth ferrite, BiFeO 3 (BFO), is one of the most promising multiferroic materials and receives special attention in recent years because of its simultaneous ferroelectricity and antiferromagnetism above room temperature (T c $ 1103 K and T N $ 643 K) [1]. Furthermore, the intrinsic magnetoelectric effect can be caused by the prospect of controlling polarization by magnetic fields, or magnetization by an electric field [2].…”

Low field manifestation of spiral ordering in sheet like BiFeO3 nanostructures

“…Refined structural parameters for sheet like BFO and their comparison with bulk and nanoparticles are given in Table I. [33][34][35] Refined lattice parameters and cell volume of present BFO system were found to agree with those bulk values. After structural refinement, hexagonal unit cell of BFO was generated by output.…”