Strain modulated transient photostriction in la and Nb codoped multiferroic BiFeO3 thin films

Authors

Zuanming Jin, Shanghai University
Yue Xu, Shanghai University
Zhengbing Zhang, Shanghai University
Xian Lin, Shanghai University
Guohong Ma, Shanghai University
Zhenxiang Cheng, University of WollongongFollow
Xiaolin Wang, University of WollongongFollow

RIS ID

73899

Publication Details

Jin, Z., Xu, Y., Zhang, Z., Lin, X., Ma, G., Cheng, Z. & Wang, X. (2012). Strain modulated transient photostriction in la and Nb codoped multiferroic BiFeO3 thin films. Applied Physics Letters, 101 (24), 242902-1-242902-5.

Abstract

The coherent longitudinal acoustic (LA) phonons in La and Nb codoped polycrystalline BiFeO3 (Bi0.8La0.2Fe 0.99Nb0.01O3 (BLFNO)) films are photo-induced and detected by the ultrafast reflectance spectroscopy. The generation mechanism of LA phonons is strongly connected with the ferroelectric polarization and is attributed to the transient photostriction effect, which is a combination of the optical rectification effect and the electrostriction effect. The strain modulation of sound velocity and out-of-plane elastic properties are demonstrated in BLFNO film on SrTiO3, which gives the insight on the dynamical coupling between electrical polarization and lattice deformation. Our findings are desired for the design of BiFeO3-based photo-driven remote control micro/nano devices. 2012 American Institute of Physics.