Patent ID: 7910907

Claim:
A method for manufacturing a memory device, comprising: forming a first electrode comprising a pipe-shaped member having an axis, a first end, a second end and sidewalls having thickness in a dimension orthogonal to the axis of the pipe-shaped member, having a ring-shaped surface at the second end, and a disc shaped member coupled to the first end of the pipe-shaped member, including forming a first layer of electrode material; forming a pillar on the first layer of electrode material, the pillar having a cylindrical outside surface; depositing a conformal layer of electrode material over the cylindrical outside surface of the pillar and over the first layer of electrode material to form an electrode material covered pillar; and removing electrode material from on top of the electrode material covered pillar to expose a top surface of the pillar and a ring-shaped top surface of the conformal layer of electrode material to form said pipe-shaped member and removing electrode material of the first layer to form said disc shaped member; forming a layer of programmable resistive material in contact with the ring-shaped top surface of the pipe-shaped member; and forming a second electrode in contact with the layer of programmable resistive material.