Study of the elastic constants in a La0.6Sr0.4MnO3 film by means of laser-generated ultrasonic wave method

Two dimensional ( 2D) displacement field of the laser- generated ultrasonic wave is detected in a two- layered structure of La0.6Sr0.4MnO3 ( LSMO)/ MgO system by means of the optical difference detection method. In order to obtain the elastic constants of the La0.6Sr0.4MnO3 thin fillm, the displacement field of the laser- generated ultrasonic wave for the La0.6Sr0.4MnO3/ MgO system is analyzed with finite element method ( FEM). We further compare the theoretical simulations with the experimental results, and the elastic constants for the LSMO film, i. e., the Young's modulus and Poisson ratio, are obtained. (c) 2006 Elsevier B. V. All rights reserved.