Phase transition and enhanced magneto-dielectric response in BiFeO3-DyMnO3 multiferroics

Satya N. Tripathy, Dhiren K. Pradhan, Karuna K. Mishra, Shrabanee Sen, Ratnakar Palai, Marian Paulch, James F. Scott, Ram S. Katiyar, Dillip K. Pradhan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

We report systematic studies on crystal structure and magneto-dielectric properties of (1 − x) BiFeO3-x DyMnO3 (0.0 ≤ x ≤ 0.2) nanoceramics synthesized by auto-combustion method. Rietveld refinement of X-ray diffraction data indicates a structural transition from R3c to R3c + Pn21a at x = 0.1. Field emission scanning electron micrographs display a decrease in grain size with increase in x. The presence of dielectric anomalies around antiferromagnetic transition temperature implies the magnetoelectric coupling. Dielectric measurements showed decrease in magnetic ordering temperature with increasing x in agreement with differential scanning calorimetry results. A significant increase in magnetization has been found with increasing DyMnO3 substitution. Magneto-impedance spectroscopy reveals a significant change (∼18%) in dielectricpermittivity at H = 2 T for x = 0.2.

Original languageEnglish
Article number144103
Number of pages10
JournalJournal of Applied Physics
Volume117
Issue number14
DOIs
Publication statusPublished - 14 Apr 2015

Keywords

  • BiFeO3 nanoparticles
  • Ferroelectrics
  • Polarization
  • Boundary

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