Magnetic and electric properties of wrinkled manganite films derived by sol-gel method

Flat and wrinkled La0.7Sr0.3MnO3 (LSMO) thin films were prepared by sol-gel method, respectively, on Si (001) substrates by adjusting heating rate at drying stage. Wrinkled film has larger grains than flat film. Coercive field (about 27Oe) of wrinkled film is higher than that of flat film, which is much low as around 5Oe. Compared with flat films, wrinkled films have larger magnetization, higher Curie temperature (334K) and peak resistivity temperature (243K), and lower resistivity (0.18Ohmcm at 300K). The introducing of wrinkles is an efficient way to induce compressive stress in sol-gel derived polycrystalline LSMO films and enhance the magnetic and electric properties.