Preparation of monoclinic 0.9(BiFeO3)-0.1(BiCoO3) epitaxial films on orthorhombic YAlO3 (100) substrates by r.f. magnetron sputtering

T. Ichinose, Hiroshi Naganuma, K. Mukaiyama, Mikihiko Ogane, Yasuo Ando

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

0.9BiFeO3-0.1BiCoO3 (BFCO) films (t=100 nm) were prepared on orthorhombic YAlO3 (YAO) (100) substrates by r.f. magnetron sputtering. Film flatness, crystallinity, crystal symmetry, and secondary phase formation are strongly affected by the pressure of the sputtering gasses, Ar and O2. Phi-scan measurements showed that the films were epitaxially grown on the substrates, with the crystal relation [101]p(101)p BFCO||[101]p(101)p YAO. X-ray reciprocal space mapping revealed that the crystal symmetry of the BFCO films was a pseudo-cubic-like monoclinic structure, with MC phase, rather than the Cm symmetry of the bulk BFCO. Cross-sectional transmission electron microscopy analysis revealed that the film had, as a result of a lattice misfit of 7%, strong compressive strain less than 10 nm from the interface, which relaxed monotonically with increasing distance from the interface. Magnetic measurements show that strained monoclinic BFCO has smaller magnetization compared to rhombohedral BFCO.

Original languageEnglish
Pages (from-to)18-22
Number of pages5
JournalJournal of Crystal Growth
Volume409
DOIs
Publication statusPublished - 2015 Jan 1

Keywords

  • A1. Monoclinic
  • B1. BiCoO
  • B1. BiFeO
  • B1. Perovskites
  • B1. YAlO substrates
  • B2. Multiferroics

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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