Patent ID: 8125040
Filing Date: 2012-02-28
Classification: G11C,H01L

Abstract:
1. A magnetic runnel junction (MTJ) structure for magnetic random access memory (MRAM) comprising: a substrate comprising a first interconnect metallization; a first electrode directly contacting the substrate and being electrically coupled to the first interconnect metallization; a plurality of MTJ layers including a first MTJ layer being coupled to the first electrode; a second electrode coupled to at least a second of the MTJ layers, the second electrode having a same first lateral dimension as at least some of the MTJ layers other than the first MTJ layer based upon a first mask; a third electrode coupled to the second electrode, the third electrode having a same second lateral dimension as the first electrode based upon a second mask; and a second interconnect metallization coupled to the third electrode, wherein the first MTJ layer has the same second lateral dimension as the first electrode and the third electrode, and the first lateral dimension is different than the second lateral dimension.