Deterministic conversion between memory and threshold resistive switching via tuning the strong electron correlation.
Intensive investigations have been launched worldwide on the resistive switching (RS) phenomena in transition metal oxides due to both fascinating science and potential applications in next generation nonvolatile resistive random access memory (RRAM) devices. It is noteworthy that most of these oxides are strongly correlated electron systems, and their electronic properties are critically affected by the electron-electron interactions. Here, using NiO as an example, we show that rationally adjusting the stoichiometry and the associated defect characteristics enables controlled room temperature conversions between two distinct RS modes, i.e., nonvolatile memory switching and volatile threshold switching, within a single device. Moreover, from first-principles calculations and x-ray absorption spectroscopy studies, we found that the strong electron correlations and the exchange interactions between Ni and O orbitals play deterministic roles in the RS operations.
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore.
Hai Yang
HY
Peng
Yong Feng
YF
Li
Wei Nan
WN
Lin
Yu Zhan
YZ
Wang
Xing Yu
XY
Gao
Tom
T
Wu
D000465:Algorithms; D055598:Chemical Phenomena; D004566:Electrodes; D004581:Electronics / Q000295:instrumentation / Q000379:methods*; D004583:Electrons; D007204:Indium / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry; D056928:X-Ray Absorption Spectroscopy
D007204:Indium; C047711:indium oxide; D009532:Nickel; C028007:nickel monoxide; D010100:Oxygen