標題: Strain modulated optical properties in BiFeO3 thin films
作者: Liu, H. L.
Lin, M. K.
Cai, Y. R.
Tung, C. K.
Chu, Y. H.
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 28-十月-2013
摘要: 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 640K 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. (c) 2013 AIP Publishing LLC.
URI: http://dx.doi.org/10.1063/1.4827639
http://hdl.handle.net/11536/23299
ISSN: 0003-6951
DOI: 10.1063/1.4827639
期刊: APPLIED PHYSICS LETTERS
Volume: 103
Issue: 18
結束頁: 
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