Patent ID: 7462858

Claim:
A phase change bridge fabrication method, comprising: depositing in sequential order 1) a first layer of phase change material over a bottom contact layer having at least one bottom electrical contact, 2) an insulating layer over the first layer of phase change material, and 3) a second layer of phase change material over the insulating layer that separates the first and second layers of phase change materials, the first phase change material having a resistance and the second phase change material having a resistance; forming a surface including a portion of the first and second layers of phase change material and a portion of the insulating layer; depositing a third layer of phase change material over the portions of the first and second layers of phase change material and the portion of the insulating layer, thereby defining a current path from the first layer of phase change material to the third layer of phase change material and to the second layer of phase change material, the third layer of phase change material having a resistance greater than the resistance of the first and second phase change materials; and forming a top electrical contact over said surface electrically coupling to the second phase change material layer.