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Effect of Pt bottom electrode texture selection on the tetragonality and physical properties of Ba 0.8Sr 0.2TiO 3 thin films produced by pulsed laser deposition

AuthorsSilva, J. P. B.; Sekhar, K. C.; Almeida, A.; Moreira, J. A.; Martín-Sánchez, Javier; Pereira, M.; Khodorov, A.; Gomes, M. J. M.
Issue Date2012
PublisherAmerican Institute of Physics
CitationJournal of Applied Physics 112: 044105 (2012)
AbstractThe effect of platinum (Pt) bottom electrode texture on the tetragonality, dielectric, ferroelectric, and polarization switching response of pulsed laser deposited Ba 0.8Sr 0.2TiO 3 (BST) thin films has been studied. The x-ray diffraction and Raman analysis revealed the higher tetragonality of BST films when they were grown on higher (111) textured Pt layer. The properties like dielectric permittivity, polarization, switching time, and leakage currents were found to be correlated to tetragonality and orientation of the BST films. The polarization current was observed to be higher in BST films on Pt epitaxial layer and it exhibits exponential dependence on the electric field. The voltage-current measurements displayed Ohmic behavior of leakage current irrespective of Pt texture for low voltages (up to 1 V), whereas at higher voltages the conduction mechanism was found to be dependent on texture selection of bottom Pt electrode. © 2012 American Institute of Physics.
Identifiersdoi: 10.1063/1.4748288
issn: 0021-8979
Appears in Collections:(CFMAC-IO) Artículos
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