Patent ID: 8488365
Filing Date: 2013-07-16
Classification: G11C,H01L

Abstract:
1. A memory cell comprising: a programmable material having first and second regions which are compositionally different from one another; ions and/or ion-vacancies diffusible into said first region; wherein the programmable material has two distinguishable and interchangeable memory states, with one of the states being a “SET” state and the other being a “RESET” state; the “SET” state passing greater current than the “RESET” state when an electrical field is applied across the programmable material; wherein the first region is of a first conductivity type in the “SET” state and the second region is of a second conductivity type in the “SET” state, with the second conductivity type being opposite of the first conductivity type; and wherein the first conductive type of the first region is induced by a concentration of the ions and/or the ion vacancies in the first region.