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We have successfully achieved high speed (~50 ns) unipolar operation in RRAM devices comprised of titanium oxynitride (TiON) combined with a control resistor connected in series. For unipolar switching, programming and erasing pulses can be the same width, typically, a few tens of nano-seconds. This enables high speed and high density cross-point RRAM memory arrays. In addition, we demonstrate how switching characteristics can be controlled by a series resistor.
Hosoi et al. (Sun,) studied this question.
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