Patent 7235419 was granted and assigned to Micron Technology on June, 2007 by the United States Patent and Trademark Office.
An inverted PCRAM cell is formed by plating the bottom electrode, made of copper for example, with a conductive material, such as silver. Chalcogenide material is disposed over the plated electrode and subjected to a conversion process so that ions from the plated material diffuse into the chalcogenide material.