Abstract:
:Polarization-driven resistive switching in ferroelectric tunnel junctions (FTJs)--structures composed of two electrodes separated by an ultrathin ferroelectric barrier--offers new physics and materials functionalities, as well as exciting opportunities for the next generation of non-volatile memories and logic devices. Performance of FTJs is highly sensitive to the electrical boundary conditions, which can be controlled by electrode material and/or interface engineering. Here, we demonstrate the use of graphene as electrodes in FTJs that allows control of interface properties for significant enhancement of device performance. Ferroelectric polarization stability and resistive switching are strongly affected by a molecular layer at the graphene/BaTiO3 interface. For the FTJ with the interfacial ammonia layer we find an enhanced tunnelling electroresistance (TER) effect of 6 × 10(5)%. The obtained results demonstrate a new approach based on using graphene electrodes for interface-facilitated polarization stability and enhancement of the TER effect, which can be exploited in the FTJ-based devices.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Lu H,Lipatov A,Ryu S,Kim DJ,Lee H,Zhuravlev MY,Eom CB,Tsymbal EY,Sinitskii A,Gruverman Adoi
10.1038/ncomms6518subject
Has Abstractpub_date
2014-11-24 00:00:00pages
5518issn
2041-1723pii
ncomms6518journal_volume
5pub_type
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