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@ARTICLE{Dai:863484,
author = {Dai, Y. and Schubert, J. and Trellenkamp, S. and Mussler,
G. and Wördenweber, R.},
title = {{S}ynaptic-like conductivity and plasticity in epitaxially
strained {S}r{T}i{O} 3 films},
journal = {Journal of applied physics},
volume = {125},
number = {24},
issn = {1089-7550},
address = {Melville, NY},
publisher = {American Inst. of Physics},
reportid = {FZJ-2019-03538},
pages = {245106 -},
year = {2019},
abstract = {In this work we use epitaxial strain and an asymmetric
electrode design to engineer the conductivity of SrTiO3 thin
films in order to use them as active components in planar
artificial synaptic devices. First, the tensile strain
imposed by the rare-earth scandate substrate on epitaxial
grown SrTiO3 films results in a significant increase of the
conductivity of the SrTiO3. Second, a further enhancement of
the conductivity is obtained by the use of Ti/Pt electrodes.
Finally, the asymmetric electrode design consisting of a
flat and a tapered electrode ensures the asymmetric response
and plasticity of electronic synapse. The modifications of
the conductivity are explained in terms of changes in the
density and mobility of oxygen vacancies. The resulting
electronic synapses (e-synapse) show memristor behavior as
well as the plasticity of the signal which both are
essential characteristics of a synapse. Similar to the
synaptic long-term and short-term potentiation/depression,
our SrTiO3 e-synapses show two different types of
plasticity, a fast process associated with the ionic dipole
formation (relaxation time in the 100 ps regime) and a slow
process defined by the mobility of oxygen vacancies
(relaxation time of several seconds).},
cin = {ICS-8},
ddc = {530},
cid = {I:(DE-Juel1)ICS-8-20110106},
pnm = {523 - Controlling Configuration-Based Phenomena (POF3-523)},
pid = {G:(DE-HGF)POF3-523},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000474439600019},
doi = {10.1063/1.5093138},
url = {https://juser.fz-juelich.de/record/863484},
}