title: Scaling effect on unipolar and bipolar resistive switching of metal oxides.
abstract: Electrically driven resistance change in metal oxides opens up an interdisciplinary research field for next-generation non-volatile memory. Resistive switching exhibits an electrical polarity dependent "bipolar-switching" and a polarity independent "unipolar-switching", however tailoring the electrical polarity has been a challenging issue. Here we demonstrate a scaling effect on the emergence of the electrical polarity by examining the resistive switching behaviors of Pt/oxide/Pt junctions over 8 orders of magnitudes in the areas. We show that the emergence of two electrical polarities can be categorised as a diagram of an electric field and a cell area. This trend is qualitatively common for various oxides including NiOx, CoOx, and TiO(2-x). We reveal the intrinsic difference between unipolar switching and bipolar switching on the area dependence, which causes a diversity of an electrical polarity for various resistive switching devices with different geometries. This will provide a foundation for tailoring resistive switching behaviors of metal oxides.
authors.affiliation: Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan. yanagi32@sanken.osaka-u.ac.jp
authors.forename: Takeshi
authors.initials: T
authors.lastname: Yanagida
authors.forename: Kazuki
authors.initials: K
authors.lastname: Nagashima
authors.forename: Keisuke
authors.initials: K
authors.lastname: Oka
authors.forename: Masaki
authors.initials: M
authors.lastname: Kanai
authors.forename: Annop
authors.initials: A
authors.lastname: Klamchuen
authors.forename: Bae Ho
authors.initials: BH
authors.lastname: Park
authors.forename: Tomoji
authors.initials: T
authors.lastname: Kawai
mesh_terms: D016248:Computer Storage Devices; D017097:Electric Impedance; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008422:Materials Testing; D008670:Metals / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*
chemical_list: D008670:Metals; D010087:Oxides