Magnetic Properties of Multilayered and Mixed $Pr_{0.65}$Ca_{0.35}MnO_3/La_{0.7}Sr_{0.3}MnO_3$ Films

  • V. G. Prokhorov (Institute of Metal Physics, NASU, Kiev Ukraine) ;
  • Lee, Y. P. (Quantum Photonic Science Research Center and Dept. Of Physics, Hanyang University) ;
  • V. S. Flis (Institute of Metal Physics, NASU, Kiev Ukraine) ;
  • Park, J. S. (Quantum Photonic Science Research Center and Dept. Of Physics, Hanyang University)
  • Published : 2003.10.01

Abstract

The magnetic properties of single- and poly-crystalline $La_{0.7}Sr_{0.3}MnO_3/Pr_{0.65}Ca_{0.35}MnO_3$ multilayered (ML) films, and composite (CP) $(La_{0.7}Sr_{0.3})_{0.5}(Pr_{0.65}Ca_{0.35}_{0.5}MnO_3$ films, prepared by laser ablation, have been investigated in a wide temperature range. It was shown that the transformation from an incoherent to a coherent interface in the ML films leads to an enhancement of the ferromagnetic coupling between layers and to a single-phase magnetic transition. The amorphous CP films demonstrate a paramagnetic behavior of the magnetization with a sharp peak at $T_{G}\approx$45 K, which was interpreted as the formation of Griffiths phase. A short-term annealing at $750^{\circ}C$ induced the complete crystallization of film, and a recovery of the ferromagnetic and the metal-insulator transitions.

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