Ferroelectric and magnetic properties of multiferroic BiFeO 3-based composite films

Hiroshi Naganuma, Tomosato Okubo, Kenji Kamishima, Koichi Kakizaki, Nobuyuki Hiratsuka, Soichiro Okamura

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

BiFeO3-based composite films were fabricated onto the Pt/Ti/SiO2/Si(100) substrates by a chemical solution deposition (CSD) method using the precursor solutions with various excess iron composition followed by annealing at 923 K for 30 minutes under oxygen gas flow. Coexistence of spontaneous magnetization and remanent polarization could be obtained in the BiFeO3-based composite films with high excess iron composition. The remanent magnetization of almost 20 emu/cm3 and the magnetic coercive field of 1.5 kOe were obtained at the iron composition ratio of Fe/Bi = 1.25. In this specimen, the remanent polarization at 90 K was approximately 10 μC/cm2 at the electric field of 1500 kV/cm. Structural analysis suggested that the remanent polarization has a possibility to increase by suppressing the formation of the secondary phases of Bi2Fe 4O9 and α-Fe2O3, these are the nonferroelectric material as well as antiferromagnetic phase.

Original languageEnglish
Article number4524983
Pages (from-to)1051-1055
Number of pages5
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume55
Issue number5
DOIs
Publication statusPublished - 2008 May
Externally publishedYes

ASJC Scopus subject areas

  • Instrumentation
  • Acoustics and Ultrasonics
  • Electrical and Electronic Engineering

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