Coupling interaction in multiferroic BaTiO3-CoFe 2O4 nanostructures

Gang Liu, Ce Wen Nan*, Z. K. Xu, H. D. Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

Recent experimental results (Zheng et al 2004 Science 303 661) have shown that a 1-3-type BaTiO3-CoFe2O4 composite film exhibited a strong coupling between the ferroelectric and ferromagnetic order parameters. The coupling interaction in the nanostructured multiferroic film could be different from that in a bulk composite because there exists a giant residual stress/strain in the film. In this paper, by considering the influence of the three-dimensional residual strain in the film, the magnetically induced polarization of the nanostructured BaTiO3-CoFe2O 4 multiferroic films has been studied using the Landau-Ginsberg- Devonshire thermodynamic theory. The calculation results show that the 1-3-type nanostructured composite film could produce a ferroelectric-ferromagnetic coupling larger than that of its bulk counterpart which is in broad agreement with the experimental results. The 2-2-type nanostructured composite films were found to produce much less coupling interaction in comparison with the 1-3-type film. The dependence of multiferroic coupling on composition and temperature was analysed on the basis of the calculated results.

Original languageEnglish
Pages (from-to)2321-2326
Number of pages6
JournalJournal of Physics D: Applied Physics
Volume38
Issue number14
DOIs
StatePublished - 21 Jul 2005

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