Patent ID: 7083990
Filing Date: 2006-08-01
Classification: H01L

Abstract:
1. A method of fabricating an MRAM cell, comprising: providing a workpiece having at least one magnetic tunnel junction (MTJ) formed thereon; forming an insulating layer made of non-conductive, isolating material over the at least one MTJ; using a damascene process to form at least two adjacent first trenches in the insulating layer; filling the first trenches in the insulating material with a conductive material; and polishing the conductive material to form conductive lines; etching at least a second trench in the insulating layer between the conductive lines, the second trench having side walls and a bottom surface at a specified aspect ratio; depositing a ferromagnetic liner material at least over the conductive lines and the second trench; and removing the ferromagnetic liner material from the bottom surface of the second trench to form ferromagnetic liners of the conductive lines.