Large room temperature magnetoresistance in La0.9Sr0.1MnO3 thin films

Abstract Epitaxial La 0.9 Sr 0.1 MnO 3 thin films were crystallized using post-annealing after deposited at room temperature, and the effect of sputtering pressure on the structural, magnetic and electrical properties was investigated. It is interesting to note that the out-of-plane lattice parameter decreases with decreasing sputtering pressure, which is attributed to the reduction of Mn 3+ /Mn 4+ ratio. Differing from the corresponding bulk material, all the films show metal-insulator (MI) transition with a significantly enhanced Curie temperature ( T C ). And the film deposited at 1.0 Pa shows the maximum T MI and T C resulted from the strongest double exchange interaction. Most significantly, the largest magnetoresistance around room temperature (−53% at 3 T and 295 K) is also observed in this film, showing great potential in application.