Nonvolatile Resistive Switching in Pt/LaAlO_{3}/SrTiO_{3} Heterostructures

Autor: Shuxiang Wu, Xin Luo, Stuart Turner, Haiyang Peng, Weinan Lin, Junfeng Ding, Adrian David, Biao Wang, Gustaaf Van Tendeloo, Junling Wang, Tom Wu
Jazyk: angličtina
Rok vydání: 2013
Předmět:
Zdroj: Physical Review X, Vol 3, Iss 4, p 041027 (2013)
Druh dokumentu: article
ISSN: 2160-3308
DOI: 10.1103/PhysRevX.3.041027
Popis: Resistive switching heterojunctions, which are promising for nonvolatile memory applications, usually share a capacitorlike metal-oxide-metal configuration. Here, we report on the nonvolatile resistive switching in Pt/LaAlO_{3}/SrTiO_{3} heterostructures, where the conducting layer near the LaAlO_{3}/SrTiO_{3} interface serves as the “unconventional” bottom electrode although both oxides are band insulators. Interestingly, the switching between low-resistance and high-resistance states is accompanied by reversible transitions between tunneling and Ohmic characteristics in the current transport perpendicular to the planes of the heterojunctions. We propose that the observed resistive switching is likely caused by the electric-field-induced drift of charged oxygen vacancies across the LaAlO_{3}/SrTiO_{3} interface and the creation of defect-induced gap states within the ultrathin LaAlO_{3} layer. These metal-oxide-oxide heterojunctions with atomically smooth interfaces and defect-controlled transport provide a platform for the development of nonvolatile oxide nanoelectronics that integrate logic and memory devices.
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