Patent ID: 7760544
Filing Date: 2010-07-20
Classification: G11C,H01L,Y10S

Abstract:
1. A method of forming a bit cell in a spin-transfer MRAM structure wherein each bit cell is comprised of two sub-cells, comprising: (a) forming a bottom electrode in each sub-cell, each of said bottom electrodes are connected to a ground voltage through a read transistor; (b) forming a MTJ cell on each bottom electrode, said MTJ cell is comprised of a first free layer that has near zero anisotropy, and has a capping layer as a top surface; (c) forming a conductive spacer on said capping layer; and (d) forming a CPP cell on said conductive spacer, said CPP cell is comprised of a second free layer that has a substantial anisotropy, and has a capping layer as a top electrode.