Strain modulated optical properties in BiFeO3 thin films

H. L. Liu, M. K. Lin, Y. R. Cai, C. K. Tung, Y. H. Chu

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Abstract

Spectroscopic ellipsometry was used to investigate the strain-dependent optical properties of BiFeO3 thin films. At room temperature, the compressively strained BiFeO3/LaAlO3 thin films show the largest band gap of about 3.12 eV. It redshifts to 2.75 eV for the tensile strained BiFeO3/NdScO3 thin films. With increasing temperature, observable anomalies in the band gap for all strained thin films near 640 K indicate that antiferromagnetic transition temperature is independent of strain and close to its bulk value, which are in good agreement with the first-principles calculations. These results further suggest a complex nature of charge-spin coupling in multiferroic BiFeO3 thin films.

Original languageEnglish
Article number181907
JournalApplied Physics Letters
Volume103
Issue number18
DOIs
Publication statusPublished - 2013 Oct 28

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Liu, H. L., Lin, M. K., Cai, Y. R., Tung, C. K., & Chu, Y. H. (2013). Strain modulated optical properties in BiFeO3 thin films. Applied Physics Letters, 103(18), [181907]. https://doi.org/10.1063/1.4827639