Revealing the flexoelectricity in the mixed-phase regions of epitaxial BiFeO3 thin films

Cheng En Cheng, Heng Jui Liu, Franco Dinelli, Yi-Chun Chen, Chen Shiung Chang, Forest Shih Sen Chien, Ying Hao Chu

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Understanding the elastic response on the nanoscale phase boundaries of multiferroics is an essential issue in order to explain their exotic behaviour. Mixed-phase BiFeO3 films, epitaxially grown on LaAlO3 (001) substrates, have been investigated by means of scanning probe microscopy to characterize the elastic and piezoelectric responses in the mixed-phase region of rhombohedral-like monoclinic (MI) and tilted tetragonal-like monoclinic (MII,tilt) phases. Ultrasonic force microscopy reveal that the regions with low/high stiffness values topologically coincide with the MI/MII,tilt phases. X-ray diffraction strain analysis confirms that the MI phase is more compliant than the MII,tilt one. Significantly, the correlation between elastic modulation and piezoresponse across the mixed-phase regions manifests that the flexoelectric effect results in the enhancement of the piezoresponse at the phase boundaries and in the MI regions. This accounts for the giant electromechanical effect in strained mixed-phase BiFeO3 films.

Original languageEnglish
Article number8091
JournalScientific reports
Volume5
DOIs
Publication statusPublished - 2015 Jan 28

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thin films
microscopy
stiffness
ultrasonics
modulation
scanning
augmentation
probes
diffraction
x rays

All Science Journal Classification (ASJC) codes

  • General

Cite this

Cheng, C. E., Liu, H. J., Dinelli, F., Chen, Y-C., Chang, C. S., Chien, F. S. S., & Chu, Y. H. (2015). Revealing the flexoelectricity in the mixed-phase regions of epitaxial BiFeO3 thin films. Scientific reports, 5, [8091]. https://doi.org/10.1038/srep08091
Cheng, Cheng En ; Liu, Heng Jui ; Dinelli, Franco ; Chen, Yi-Chun ; Chang, Chen Shiung ; Chien, Forest Shih Sen ; Chu, Ying Hao. / Revealing the flexoelectricity in the mixed-phase regions of epitaxial BiFeO3 thin films. In: Scientific reports. 2015 ; Vol. 5.
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Revealing the flexoelectricity in the mixed-phase regions of epitaxial BiFeO3 thin films. / Cheng, Cheng En; Liu, Heng Jui; Dinelli, Franco; Chen, Yi-Chun; Chang, Chen Shiung; Chien, Forest Shih Sen; Chu, Ying Hao.

In: Scientific reports, Vol. 5, 8091, 28.01.2015.

Research output: Contribution to journalArticle

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AU - Dinelli, Franco

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AU - Chang, Chen Shiung

AU - Chien, Forest Shih Sen

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