Patent ID: 7630232
Filing Date: 2009-12-08
Classification: B82Y,G11C,H01F,H01L

Abstract:
1. A magnetic random access memory (MRAM) structure having a toggle MTJ cell wherein a synthetic anti-ferromagnetic (SAF) free layer is formed adjacent to a tunnel barrier layer and is comprised of a stack that has a first major sub-layer disposed on the tunnel barrier layer, an anti-parallel coupling layer on the first major sub-layer, and a second major sub-layer on the anti-parallel coupling layer, said major sub-layers are each comprised of: (a) a plurality of “n” minor sub-layers that are ferromagnetic in which one minor sub-layer is adjacent to the anti-parallel coupling layer and wherein n is an integer >1; and (b) “n−1” parallel coupling layers arranged such that there is a parallel coupling layer between adjacent minor sub-layers.