Structure and magnetic properties of La_(0.67)Sr_(0.33)MnO3 thin films prepared by sol-gel method

摘要

La1_xSr_xMnO3 (x = 0.33) (LSMO) thin films have been fabricated successfully by sol-gel method on two different types of substrates, Si (111) and SrTiO3 (STO) (001). Microstructure and magnetic properties of LSMO thin films have been investigated. The X-ray diffraction studies of the films confirm the pure phase of the LSMO thin films. In contrast with LSMO thin films on Si substrate, the performances of LSMO on STO substrate are superior both from structural and magnetic properties. For me samples deposited on STO substrate, highly preferred orientation as well as less strain and grain defects was found; in other aspect, the magnetization, the residual and saturation moment value, tended greater while a decreased coercive field required merely (saturation moment value was about five times and coercive field was only about 13 % of those on Si substrate). The Curie temperature of LSMO thin films on Si and STO substrates is estimated to be about 349.7 and 359 K, respectively.