Strain modulated optical properties in BiFeO3 thin films

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

doi:10.1063/1.4827639

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

44 Citations (Scopus)

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 language	English
Article number	181907
Journal	Applied Physics Letters
Volume	103
Issue number	18
DOIs	https://doi.org/10.1063/1.4827639
Publication status	Published - 2013 Oct 28

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Strain modulated optical properties in BiFeO3 thin films",

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.",

author = "Liu, {H. L.} and Lin, {M. K.} and Cai, {Y. R.} and Tung, {C. K.} and Chu, {Y. H.}",

note = "Funding Information: We thank financial support from the National Science Council of Republic of China under Grant No. NSC 101-2112-M-003-003. ",

year = "2013",

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doi = "10.1063/1.4827639",

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T1 - Strain modulated optical properties in BiFeO3 thin films

AU - Liu, H. L.

AU - Lin, M. K.

AU - Cai, Y. R.

AU - Tung, C. K.

AU - Chu, Y. H.

N1 - Funding Information: We thank financial support from the National Science Council of Republic of China under Grant No. NSC 101-2112-M-003-003.

PY - 2013/10/28

Y1 - 2013/10/28

N2 - 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.

AB - 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.

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Strain modulated optical properties in BiFeO₃ thin films

Abstract

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