Magnetic and transport properties driven by lattice strain in La0.7Ca0.3MnO3/BaTiO3 and La0.7Sr0.3MnO3/BaTiO3 bilayered films

Автор(и)

  • V.G. Prokhorov Institute of Metal Physics of the National Academy of Sciences of Ukraine, Kiev 03142, Ukraine
  • V.A. Komashko Institute of Metal Physics of the National Academy of Sciences of Ukraine, Kiev 03142, Ukraine
  • G.G. Kaminsky Institute of Metal Physics of the National Academy of Sciences of Ukraine, Kiev 03142, Ukraine
  • K.K. Yu q-PSI and Department of Physics, Hanyang University, Seoul 133-791, Korea
  • S.J. Jun q-PSI and Department of Physics, Hanyang University, Seoul 133-791, Korea
  • S.Y. Park q-PSI and Department of Physics, Hanyang University, Seoul 133-791, Korea
  • J.S. Park q-PSI and Department of Physics, Hanyang University, Seoul 133-791, Korea
  • Y.P. Lee q-PSI and Department of Physics, Hanyang University, Seoul 133-791, Korea
  • V.L. Svetchnikov National Center for HREM, TU Delft, 2628AL, The Netherlands

DOI:

https://doi.org/10.1063/1.2409635

Ключові слова:

magnetotransport properties, ferromagnetic/ferroelectric films, microstructure peculiarities.

Анотація

The microstructure and the magnetic and transport properties of La0.7Ca0.3MnO3 and La0.7Sr0.3MnO3 films deposited on a BaTiO3 layer (LCMO/BTO and LSMO/BTO) and on a LaAlO3 (001) single crystal (LCMO/LAO and LSMO/LAO) by rf-magnetron sputtering using «soft» (or powder) targets are investigated. The films grown on BTO demonstrate biaxial tensile in-plane and compressive out-of-plane strains, while the films grown on LAO, in contrast, manifest compressive in-plane and tensile out-of-plane strains. The films with biaxial tensile in-plane lattice strain undergo the magnetic transition at a higher temperature than that for the biaxial compressive case. This argues that the Mn–O–Mn bond-angle variation, controlled by the lattice strain, plays a more important role in the formation of the spin ordering than the attendant modification of the Mn–O bond length. It was shown that the magnetic inhomogeneity, expressed by a significant difference between the field-cooled and zero-field-cooled temperature-dependent magnetization, has a metallurgical rather than an electronic nature, and is controlled by the crystal lattice distortion and the microstructure defects. The observed enhancement of the magnetoresistance effect in the LSMO/BTO bilayer at room temperature make this object greatly beneficial in the development of new hybrid ferromagnetic/ferroelectric devices.

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Опубліковано

2006-11-23

Як цитувати

(1)
Prokhorov, V.; Komashko, V.; Kaminsky, G.; Yu, K.; Jun, S.; Park, S.; Park, J.; Lee, Y.; Svetchnikov, V. Magnetic and Transport Properties Driven by Lattice Strain in La0.7Ca0.3MnO3/BaTiO3 and La0.7Sr0.3MnO3/BaTiO3 Bilayered Films. Fiz. Nizk. Temp. 2006, 33, 78-87.

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Низькотемпературний магнетизм

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