Polarized Raman spectroscopy of nearly-tetragonal BiFeO${}_3$ thin films

Abstract

BiFeO${}_3$ thin films can be epitaxially stabilized in a nearly-tetragonal phase under a high biaxial compressive strain. Here we investigate the polarized Raman spectra of constrained BiFeO${}_3$ films with tetragonal-like (BFO-T), rhombohedral-like (BFO-R) and multiphase (BFO-T+R) structure. Based on analysis of the number and symmetry of the Raman lines, we provide strong experimental evidence that the nearly-tetragonal films are monoclinic ($Cc$ symmetry) and not tetragonal $(P4mm)$. Through the Raman mapping technique we show localized coexistence of BFO-T and BFO-R phases with the relative fraction dependent on the film thickness.

4 pages, 4 figures, 1 table

References in corpus (5)

• The beta Phase of Multiferroic Bismuth Ferrite and its beta-gamma Metal-Insulator Transition
• Effect of epitaxial strain on the spontaneous polarization of thin film ferroelectrics
• Strain-induced isosymmetric phase transition in BiFeO3
• Electric field effect on BiFeO${}_3$ single crystal investigated by Raman spectroscopy
• Phonon Spectroscopy Near Phase Transition Temperatures in Multferroic BiFeO3 Epitaxial Thin Films

Cited by in corpus (9)

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• A Nanoscale Shape Memory Oxide
• Phase transition close to room temperature in BiFeO3 thin films
• Anomalous low-energy phonons in nearly tetragonal BiFeO3 thin films
• The Magnetoelastic Distortion of Multiferroic BiFeO${}_3$ in the Canted Antiferromagnetic State
• Patterning enhanced tetragonality in BiFeO3 thin films with effective negative pressure by helium implantation
• Structural behaviour of BiFeO3/SrRuO3 superlattices: an X-ray diffraction and Raman spectroscopy investigation
• Built-in electric field induces polarization rotation in bilayer BiFeO3/(Ba,Sr)TiO3 thin films