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Spectromicroscopic insights for rational design of redox-based memristive devices.

Abstract：

:The demand for highly scalable, low-power devices for data storage and logic operations is strongly stimulating research into resistive switching as a novel concept for future non-volatile memory devices. To meet technological requirements, it is imperative to have a set of material design rules based on fundamental material physics, but deriving such rules is proving challenging. Here, we elucidate both switching mechanism and failure mechanism in the valence-change model material SrTiO3, and on this basis we derive a design rule for failure-resistant devices. Spectromicroscopy reveals that the resistance change during device operation and failure is indeed caused by nanoscale oxygen migration resulting in localized valence changes between Ti(4+) and Ti(3+). While fast reoxidation typically results in retention failure in SrTiO3, local phase separation within the switching filament stabilizes the retention. Mimicking this phase separation by intentionally introducing retention-stabilization layers with slow oxygen transport improves retention times considerably.

journal_name

Nat Commun

journal_title

Nature communications

authors

Baeumer C,Schmitz C,Ramadan AH,Du H,Skaja K,Feyer V,Müller P,Arndt B,Jia CL,Mayer J,De Souza RA,Michael Schneider C,Waser R,Dittmann R

doi

10.1038/ncomms9610

subject

Has Abstract

pub_date

2015-10-19 00:00:00

pages

8610

issn

2041-1723

pii

ncomms9610

journal_volume

6

pub_type

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