Microstructure and phase control in Bi-Fe-O multiferroic nanocomposite thin films

M. Murakami, S. Fujino, S. H. Lim, L. G. Salamanca-Riba, M. Wuttig, I. Takeuchi, Bindhu Varughese, H. Sugaya, T. Hasegawa, S. E. Lofland

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Abstract

We report on the controlled multiphase thin film growth in the Bi-Fe-O system. By varying the deposition oxygen pressure, the dominant phase formed in the film continuously changes from ferroelectric BiFeO 3 to a mixture of α-Fe 2O 3 and ferromagnetic γ-Fe 2O 3. X-ray diffraction and high-resolution transmission electron microscopy have revealed that epitaxial multiferroic nanocomposites consisting of BiFeO 3 and Fe 2O 3 are formed when the deposition pressure is ≈5 mTorr. In order to investigate the previously reported anomalous enhancement in magnetization in BiFeO 3, we have fabricated a thickness gradient pure BiFeO 3 film. The out-of-plane lattice constant was found to increase continuously as the thickness is decreased from 300 to 5 nm, but no significant enhancement in magnetization was observed.

Original languageEnglish (US)
Article number112505
JournalApplied Physics Letters
Volume88
Issue number11
DOIs
StatePublished - 2006

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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