(color online) The applications of new type RRAM: physical switching. (a)–(c) Multilevel storage ability demonstration of physical switching.^[90] (a) Switching characteristics, (b) repeatable ability demonstration, and (c) each bit retention ability demonstration. (d)–(f) Flexible electronic storage demonstration.^[91] (d) Schematic of graphene/SiO_x/graphene, (e) switching characteristics, and (f) demonstration of flexible storage.