Ferromagnetism and ferroelectricity of Bi 2 O 3 -Fe 2 O 3 -PbTiO 3 amorphous oxide films prepared by gel-coating technique

Takaya Wada, Yuichi Tokunaga, Atsushi Kajima, Mitsuteru Inoue, Toshitaka Fujii, Balachandran Jeyadevan, Kazuyuki Tohji

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Previously we reported that rf-sputtered Bi 2 O 3 -Fe 2 O 3 -ABO 3 films (ABO 3 : Perovskite either of BaTiO 3 , PbTiO 3 , or PbZrO 3 ) have pronounced properties exhibiting magnetic as well as dielectric hysteresis loops simultaneously above room temperature for films with a restricted Fe 2 O 3 -concentration of about 70 at% after subject to thermal annealing at about 700°C. In the present study, we have prepared the same oxide films by the sol-gel method, where PbTiO 3 was chosen for ABO 3 . It was found that gel-coated films onto glass substrates and/or low-resistivity Si-wafers also possess the properties similar to those of rf-sputtered films. Microstructure of the films was examined by EXAFS measurement at the Fe-absorption edge. It may be concluded that a disordered oxide state having a random glass network structure is essential for realizing magnetic and dielectric ordered state, presumably caused by strong frustration in a glassy antiferromagnet.

Original languageEnglish
Pages (from-to)212-216
Number of pages5
JournalApplied Surface Science
Volume113-114
DOIs
Publication statusPublished - 1997 Apr

Keywords

  • Amorphous oxide films
  • EXAFS
  • Ferroelectricity
  • Ferromagnetism
  • Sol-gel method
  • Spin-on process

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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