Ultrafast photostriction in BiFeO$_{3}$ thin films

ORAL

Abstract

The ultrafast dynamics of BiFeO$_{3}$ (BFO) thin films was studied by dual-color transient reflectivity measurements ($\Delta R/R$) from 80 K to room temperature. Based on the thickness-dependent propagating time of the photoinduced strain pulse, the sound velocity along [110] direction of BFO is 4.76 km/s. Anisotropic photostriction effect in BFO generated within short time scale of 5 ps is enhanced by the optical rectification effect. Furthermore, the anomalous changes of the temperaure-dependent $\Delta R/R$ at 130 K and 210 K may reveal the spin-orbital coupling and magnetoelastic effect in BFO.

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Authors

  • L.Y. Chen

    • Department of Electrophysics, National Chiao Tung University, Hsinchu 300, Taiwan

  • C.W. Luo

    • Department of Electrophysics, National Chiao Tung University, Hsinchu 300, Taiwan

  • Y.H. Chu

    • Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 300, Taiwan

  • T. Kobayashi

    • Department of Electrophysics, National Chiao Tung University, Hsinchu 300, Taiwan