Manipulating magnetoresistance near room temperature in la _0.67Sr_0.33MnO₃/La_0.67Ca _0.33MnO₃ films prepared by polymer assisted deposition

A large magnetoresistance (MR) near room temperature is obtained by preparing multilayer-coated La_0.67Sr_0.33MnO ₃/La_0.67Ca_0.33MnO₃ (LSMO/LCMO) films using polymer assisted deposition (PAD). A low-temperature pyrolysis was carried out after each coating and a high-temperature annealing was employed after the deposition of all layers in the cost-effective PAD process. The number of layers and individual layer thicknesses were varied, while the LSMO/LCMO volume ratio was kept constant. The single phase La_0.67Sr _0.198Ca_0.132MnO₃ film, which is a uniformly mixed phase of the LSMO/LCMO at a volume ratio of 60:40, shows a maximum MR of -58% at 280 K. These results indicate that the transition temperature and the magnitude of the MR can be manipulated through multilayer coating of two ferromagnetic materials.