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Open Access Publications from the University of California

Spatially uniform resistance switching of low current, high endurance titanium-niobium-oxide memristors

  • Author(s): Kumar, S
  • Davila, N
  • Wang, Z
  • Huang, X
  • Strachan, JP
  • Vine, D
  • David Kilcoyne, AL
  • Nishi, Y
  • Stanley Williams, R
  • et al.

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© 2017 The Royal Society of Chemistry. We analyzed micrometer-scale titanium-niobium-oxide prototype memristors, which exhibited low write-power (<3 μW) and energy (<200 fJ per bit per μm2), low read-power (∼nW), and high endurance (>millions of cycles). To understand their physico-chemical operating mechanisms, we performed in operando synchrotron X-ray transmission nanoscale spectromicroscopy using an ultra-sensitive time-multiplexed technique. We observed only spatially uniform material changes during cell operation, in sharp contrast to the frequently detected formation of a localized conduction channel in transition-metal-oxide memristors. We also associated the response of assigned spectral features distinctly to non-volatile storage (resistance change) and writing of information (application of voltage and Joule heating). These results provide critical insights into high-performance memristors that will aid in device design, scaling and predictive circuit-modeling, all of which are essential for the widespread deployment of successful memristor applications.

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