Patent ID: 7211849
Filing Date: 2007-05-01
Classification: B82Y,G11C,H01F,H01L

Abstract:
1. A magnetic memory structure, comprising: a plurality of magnetic memory stacks for an MRAM, each stack having at least a first magnetic layer, a barrier layer, and a second magnetic layer, each stack in a stud configuration and having a top surface; spacers having vertical inner walls and having outer walls that taper convexly towards an upper surface, the spacers disposed around the magnetic memory stacks such that lower portions of spacers surround the first magnetic layers, the barrier layers, and the second magnetic layers of the stacks, the spacers comprising a first dielectric material, portions of the spacers extending above the top surface of the magnetic memory stacks, the spacers defined such that horizontal portions of spacer material between adjacent magnetic memory stacks are absent; a first insulator layer around the spacers, the first insulator layer comprising a second dielectric material different from the first dielectric material, the top surfaces of the magnetic memory stacks having a height recessed below a height of a top surface of the first insulator layer; and a metal conductor in contact with the top surface of the magnetic memory stacks.