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

Hiroshi Naganuma, Jun Miura, Soichiro Okamura

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We fabricated 5 at.% Mn-added polycrystalline BiFeO3 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 BiFeO3 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 BiFeO3 films. The conduction mechanism of the Mn-added BiFeO3 films was dominated by Ohmic conduction. Remanent polarization of the Mn-added polycrystalline BiFeO3 films for an applied electric field of approximately 1.5 mV/cm was 63 μC/cm2 for the specimen annealed at 773 K and 46 μC/cm2 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 Mn-added polycrystalline BiFeO3 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 BiFeO3 film.

Original languageEnglish
Pages (from-to)203-208
Number of pages6
JournalJournal of Electroceramics
Volume22
Issue number1-3
DOIs
Publication statusPublished - 2009 Feb 1
Externally publishedYes

Keywords

  • BiFeO
  • Ferroelectric property
  • Film
  • Magnetic property
  • Mn additive
  • Multiferroics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering
  • Materials Chemistry

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