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-Jan-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
Appears in Collections:Articles