Enhanced magnetoelectric coupling in dysprosium-doped BiFeO3 on the formation of nanocomposite with SrFe12O19

Nanocomposites (NCs) containing strontium hexaferrite (SrFe12O19, SFO) and dysprosium-substituted bismuth ferrite (Bi0.9Dy0.1FeO3, BDFO) with composition x SrFe12O19 - (1-x) Bi0.9Dy0.1FeO3, with x = 0.1, 0.2, and 0.3, have been synthesized using the sol-gel route and their structural, magnetic, dielectric and magnetoelectric properties have been investigated. Formation of pure crystalline x SFO - (1-x) BDFO NCs is confirmed by XRD measurements. Magnetization and dielectric constant (epsilon(r)) of the pristine BiFeO3 (BFO) have been found to increase on Dy-substitution. In the nanocomposite samples, magnetization increases, but dielectric constant decreases with increasing SFO content. Variation of capacitance of the NC samples in the presence of magnetic field up to 150 kOe indicates a substantial enhancement of the magnetoelectric (ME) coupling coefficient of BFO in the nanocomposites. ME coupling tends to improve with higher SFO content in the NCs. (C) 2020 Published by Elsevier B.V.

Automated summary

This study synthesized nanocomposites (NCs) containing SrFe12O19 and Bi0.9Dy0.1FeO3, where Dy-substitution increased the magnetization and dielectric constant of BiFeO3 (BFO), while increasing SFO content in the NCs led to higher magnetization but lower dielectric constant. The changes in capacitance of the NC samples in the presence of a magnetic field up to 150 kOe indicated a substantial enhancement of the magnetoelectric (ME) coupling coefficient of BFO in the nanocomposites, which tended to improve with higher SFO content in the NCs.