標題: | Ultrafast Dynamics of BiFeO3 Thin Films Studied by Dual-Color Femtosecond Spectroscopy |
作者: | Chen, L. Y. Yang, J. C. Shih, H. C. Liang, C. W. Wu, T. -Y. Chou, S. K. Luo, C. W. Wu, K. H. Chu, Y. H. Kobayashi, T. 材料科學與工程學系 電子物理學系 Department of Materials Science and Engineering Department of Electrophysics |
關鍵字: | Multiferroics;BFO;Magnon;Pump-probe spectroscopy |
公開日期: | 1-一月-2011 |
摘要: | The ultrafast dynamics in (100)-oriented BiFeO3 thin films were studied from 20 K to 300 K by using the dual-color femtosecond pump-probe spectroscopy, which were performed by the 400 nm (3.1 eV) pump pulses above the energy gap of 2.67 eV and the 800 nm (1.55 eV) probe pulses below the energy gap of 2.67 eV. From the temperature-dependent transient reflectivity changes (Delta R/R), the anomalous changes were clearly observed below 200 K caused by magnons. Thus, the femtosecond pump-probe spectroscopy could unambiguously reveal the magnetization dynamics in BiFeO3 with strong magnetoelectric coupling. |
URI: | http://dx.doi.org/10.1007/s10948-010-0964-9 http://hdl.handle.net/11536/150294 |
ISSN: | 1557-1939 |
DOI: | 10.1007/s10948-010-0964-9 |
期刊: | JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM |
Volume: | 24 |
起始頁: | 731 |
結束頁: | 734 |
顯示於類別: | 期刊論文 |