Structure and magnetic properties of La0.67Sr0.33MnO3 thin films prepared by sol–gel method
La1−xSrxMnO3 (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 the 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.
KeywordsSol–gel LSMO Crystal structure Magnetic properties
This study was sponsored by State Key Basic Research Program of China (Grant No. 61176011), Changjiang Scholars and Innovative Research Team in University, National Basic Research Project (Grant No. 2013CB922301), Fundamental Research Funds for the Central Universities (ECNU), KLIFMD-2011-06 and PCSIRT.