Modified magnetic properties of La0.7Sr0.3MnO3 film by magnetic-field annealing

The chemical solution deposition was used to synthesize La0.7Sr0.3MnO3 (LSMO) films. Effects of external magnetic-field (Hext=5 kOe) annealing on microstructure and magnetic properties were investigated. Under the effect of external magnetic field, FE-SEM images indicate that the mean grain size of LSMO film increases. X-ray diffraction results show that all the LSMO films are single-phase rhombohedral structure with a space group of R3¯C. The coercivity (Hc) of the magnetic-field annealing LSMO film decreases slightly. The values of Curie temperature (TC) and saturation magnetization (Ms) are obviously enhanced, which can be explained by the influence of the magnetic texture and enlarged grain size.