Probing mixed tetragonal/rhombohedral-like monoclinic phases in strained bismuth ferrite films by optical second harmonic generation

Amit Kumar, Sava Denev, Robert J. Zeches, Eftihia Vlahos, Nikolas J. Podraza, Alexander Melville, Darrell G. Schlom, R. Ramesh, Venkatraman Gopalan

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Epitaxial strain can induce the formation of morphotropic phase boundary in lead free ferroelectrics like bismuth ferrite, thereby enabling the coexistence of tetragonal and rhombohedral phases in the same film. The relative ratio of these phases is governed by the film thickness and theoretical studies suggest that there exists a monoclinic distortion of both the tetragonal as well as the rhombohedral unit cells due to imposed epitaxial strain. In this work we show that optical second harmonic generation can distinguish the tetragonal-like phase from the rhombohedral-like phase and enable detection of monoclinic distortion in only a pure tetragonal-like phase.

Original languageEnglish (US)
Article number112903
JournalApplied Physics Letters
Volume97
Issue number11
DOIs
StatePublished - Sep 13 2010

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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