Composition dependence in BiFeO3 film capacitor with suppressed leakage current by Nd and Mn cosubstitution and their ferroelectric properties

Takeshi Kawae, Hisashi Tsuda, Hiroshi Naganuma, Satoru Yamada, Minoru Kumeda, Soichiro Okamura, Akiharu Morimoto

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)

Abstract

(Nd,Mn)-cosubstituted BiFeO3 (BFO) films with various Nd and Mn compositions were fabricated on a Pt/SrTiO3(100) substrate by pulsed laser deposition. X-ray diffraction patterns and atomic force microscopy images indicated that the suppression of impurity phases and a smooth surface morphology were realized by Nd substitution in the BFO films. Furthermore, by combining with Nd substitution, a small amount of Mn substitution in BFO films is effective for reducing the leakage current density by three orders of magnitude compared with that of a BFO film capacitor. The polarization vs electric field (P-E) curves showed a strong dependence of measurement frequency in the range of 0.1-2 kHz, and well-saturated P-E hysteresis loops were observed at 20kHz at room temperature. The remanent polarization and coercive field at a maximum electric field of 1.9MV/cm were approximately 70μC/cm2 and 0.32MV/cm, respectively.

Original languageEnglish
Pages (from-to)7586-7589
Number of pages4
JournalJapanese journal of applied physics
Volume47
Issue number9 PART 2
DOIs
Publication statusPublished - 2008 Sep 19

Keywords

  • BiFeO
  • Cosubstitution
  • Mn
  • Nd
  • PLD
  • Pb-free materials
  • Thin films

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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