Estimation of leakage current density and remanent polarization of BiFeO3 films with low resistivity by positive, up, negative, and down measurements

Hiroshi Naganuma, Yosuke Inoue, Soichiro Okamura

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Polycrystalline BiFeO3 film was fabricated by chemical solution deposition (CSD) on 111-textured Pt/Ti/SiO2/Si(100) substrates followed by post-annealing at 923K in air. The leakage current density was estimated by pulse response of a positive, up, negative, and down (PUND) measurement. It was revealed that the leakage current density estimated by PUND measurements is useful for high leakage current materials because the dielectric breakdown could be extended to the high electric field region when compared to a conventional measurement way using a pico-ampere meter. Therefore, the changing point of the leakage current mechanism at the higher electric field of 0.3 MV/cm could be observed by using the PUND method in the present specimen. When the temperature was decreased, it was revealed that the leakage current component did not affect the ferroelectric polarization below 150 K in the case of present specimen. At 93 K, where leakage current was suppressed, the remanent polarizations were evaluated by ferroelectric hysteresis loops and PUND, and it was revealed that the remanent polarization did not saturate until an electric field of 1.4 MV/cm was applied (Pr = 89 μC/cm2 at P-E loop, 2Pr = 164μC/cm2 at PUND). This result indicates the potential of BiFeO3 to have quite high remanent polarization.

Original languageEnglish
Pages (from-to)5558-5560
Number of pages3
JournalJapanese journal of applied physics
Volume47
Issue number7 PART 1
DOIs
Publication statusPublished - 2008 Jul 11
Externally publishedYes

Keywords

  • BiFeO films
  • Leakage current
  • PUND
  • Temperature dependence

ASJC Scopus subject areas

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

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