info:eu-repo/semantics/article
Concurrent ionic migration and electronic effects at the memristive TiOx/La1/3Ca2/3MnO3-x interface
Fecha
2018-02Registro en:
Roman Acevedo, Wilson Stibens; Ferreyra, Cristian Daniel; Sánchez, M.J.; Acha, Carlos Enrique; Gay, R.; et al.; Concurrent ionic migration and electronic effects at the memristive TiOx/La1/3Ca2/3MnO3-x interface; IOP Publishing; Journal of Physics D: Applied Physics; 51; 12; 2-2018; 1-13
0022-3727
CONICET Digital
CONICET
Autor
Roman Acevedo, Wilson Stibens
Ferreyra, Cristian Daniel
Sánchez, M.J.
Acha, Carlos Enrique
Gay, R.
Rubi, Diego
Resumen
The development of reliable redox-based resistive random-access memory devices requires understanding and disentangling concurrent effects present at memristive interfaces. We report on the fabrication and electrical characterization of TiOx/La1/3Ca2/3MnO3-x microstructured interfaces and on the modeling of their memristive behavior. We show that a careful tuning of the applied external electrical stimuli allows controlling the redox process between both layers, obtaining multilevel non-volatile resistance states. We simulate the oxygen vacancies dynamics at the interface between both oxides, and successfully reproduce the experimental electrical behavior after the inclusion of an electronic effect, related to the presence of an n-p diode at the interface. The formation of the diode is due to the n- and p-character of TiOx and La1/3Ca2/3MnO3-x, respectively. Our analysis indicates that oxygen vacancies migration between both layers is triggered after the diode is polarized either in forward mode or in reverse mode above breakdown. Electrical measurements at different temperatures suggest that the diode can be characterized as Zener-type. The advantages of our junctions for their implementation in RRAM devices are finally discussed.