Magnetic properties of LCMO deposited films

Abstract La–Ca–Mn–O films were deposited with various thickness (500, 1000 and 1500°C) by RF-magnetron sputtering at 700°C and by the spin coating of sol–gel method at 400°C on LaAlO3(1 0 0) and Si(1 0 0) single-crystal substrates. The crystal structure and chemical composition of the film grown by RF sputtering method were orthorhombic and La0.89Ca0.11MnO3, respectively, while the film prepared by sol–gel spin coating was cubic with La0.7Ca0.3MnO3. The temperature dependence of the resistance for the film grown by RF sputtering method with the thickness of 1000°C shows that a semiconductor-metal transition occurs at 242 K. The relative maximum magnetoresistance is about 273% at 226 K.