title: Evolution of conduction channel and its effect on resistance switching for Au-WO₃-x-Au devices.
abstract: We performed a systematic investigation on the dynamic behavior of conduction filaments (CFs) in WO₃-x-based devices. It was found that the electric forming produced an electric structure consisted of a conductive channel (virtual cathode) started from cathode and an insulating band surrounding anode. Both the virtual cathode and the insulating region varied with repeated resistance switching. Set/reset operation affected device resistance mainly by modifying the CF, which formed in the setting process together with an insulating halo that separated it from the virtual cathode. The device resistance exhibited a sudden change exactly corresponding to the emergence/vanishing of the CF and a smooth variation corresponding to the outward/inward expansion/contraction of the insulating halo. Anode ablation occurred after repeated cycling, and it is the key factor affecting the endurance of device.
authors: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academic of Sciences, Beijing 100190, China.
authors: D S
authors: DS
authors: Hong
authors: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academic of Sciences, Beijing 100190, China.
authors: Y S
authors: YS
authors: Chen
authors: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academic of Sciences, Beijing 100190, China.
authors: Ying
authors: Y
authors: Li
authors: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academic of Sciences, Beijing 100190, China.
authors: H W
authors: HW
authors: Yang
authors: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academic of Sciences, Beijing 100190, China.
authors: L L
authors: LL
authors: Wei
authors: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academic of Sciences, Beijing 100190, China.
authors: B G
authors: BG
authors: Shen
authors: Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academic of Sciences, Beijing 100190, China.
authors: J R
authors: JR
authors: Sun