Strain modulated optical properties in BiFeO3 thin films

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


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
Issue number18
Publication statusPublished - 2013 Oct 28

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


Dive into the research topics of 'Strain modulated optical properties in BiFeO3 thin films'. Together they form a unique fingerprint.

Cite this