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Interfacial resistive switching properties in Ti/La 0.7 Ca 0.3 MnO 3 /Pt sandwich structures
Author(s) -
Liu X. J.,
Li X. M.,
Wang Q.,
Yang R.,
Cao X.,
Yu W. D.,
Chen L. D.
Publication year - 2010
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200925409
Subject(s) - annealing (glass) , materials science , oxygen , electrode , hysteresis , electrochemistry , analytical chemistry (journal) , protein filament , pulsed laser deposition , thin film , nanotechnology , composite material , chemistry , condensed matter physics , physics , organic chemistry , chromatography
La 0.7 Ca 0.3 MnO 3 (LCMO) films with and without in situ oxygen annealing have been prepared by pulsed laser deposition. After depositing Ti top electrodes (TEs) at room temperature, both the Ti/LCMO/Pt structures show a reversible, nonlinear, and hysteretic current–voltage ( I–V ) characteristics. The switching ratio between high and low resistance state is significantly reduced by in situ oxygen annealing due to the decrease of oxygen vacancies in the surface of LCMO film. Moreover, the switching ratio is also significantly reduced by depositing Ti TEs at a higher temperature such as 200 °C. These results suggest that the oxidation/reduction reaction between the TiO x interlayer and the oxygen‐deficient LCMO layer plays a crucial role in the resistive switching of the Ti/LCMO/Pt structures. Furthermore, it is also suggested that the formation/rupture of the conductive filament paths in the TiO x interlayer by the electrochemical migration of oxygen is responsible for the anomalous changes of current and the large hysteresis in the I–V curves.