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Heteroepitaxial oxide-based nanocomposite films possessing a variety of functional properties have attracted tremendous research interest. Here, self-assembled vertically aligned nanocomposite (Pr 0.5 Ba 0.5 MnO 3 ) 1- x  :(CeO 2 )  x   ( x  = 0.2 and 0.5) films have been successfully grown on single-crystalline (001) (La,Sr)(Al,Ta)O 3  substrates by the pulsed laser deposition technique. Self-assembling behavior of the nanocomposite films and atomic-scale interface structure between Pr 0.5 Ba 0.5 MnO 3  matrix and CeO 2  nanopillars have been investigated by advanced electron microscopy techniques. Two different orientation relationships, (001)[100] Pr0.5Ba0.5MnO3 //(001)[1-10] CeO2  and (001)[100] Pr0.5Ba0.5MnO3 //(110)[1-10] CeO2 , form between Pr 0.5 Ba 0.5 MnO 3  and CeO 2  in the (Pr 0.5 Ba 0.5 MnO 3 ) 0.8 :(CeO 2 ) 0.2  film along the film growth direction, which is essentially different from vertically aligned nanocomposite (Pr 0.5 Ba 0.5 MnO 3 ) 0.5 :(CeO 2 ) 0.5  films having only (001)[100] Pr0.5Ba0.5MnO3 //(001)[1-10] CeO2  orientation relationship. Both coherent and semi-coherent Pr 0.5 Ba 0.5 MnO 3 /CeO 2  interface appear in the films. In contrast to semi-coherent interface with regular distribution of interfacial dislocations, interface reconstruction occurs at the coherent Pr 0.5 Ba 0.5 MnO 3 /CeO 2  interface. Our findings indicate that epitaxial strain imposed by the concentration of CeO 2  in the nanocomposite films affects the self-assembling behavior of the vertically aligned nanocomposite (Pr 0.5 Ba 0.5 MnO 3 ) 1-x :(CeO 2 ) x  films.

scientific reports

Self-assembling behavior and interface structure in vertically aligned nanocomposite (Pr0.5Ba0.5MnO3)1-x:(CeO2)x films on (001) (La,Sr)(Al,Ta)O3 substrates