Patent ID: 8921959

Claim:
A magnetoresistive random access memory (MRAM) device comprising: a bottom electrode over a substrate; a stack over the bottom electrode, the stack comprising a magnetic tunnel junction (MTJ) and a top electrode, the MTJ having a first width; a dielectric material along a curved sidewall of the stack, a portion of the dielectric material being in a recess of the bottom electrode, the dielectric material having a height greater than a thickness of the MTJ and less than a stack height; a dielectric layer over the stack and the dielectric material; a capping layer conformally over the stack and the dielectric material, the capping layer having a middle portion and edge portions, the middle portion being thicker than the edge portions, the middle portion overlying a top surface of the bottom electrode and the edge portions adjoining sidewalls of the bottom electrode, the dielectric layer being over the capping layer; and a conductive material extending through the dielectric layer and having an interface with the top electrode of the stack, the top electrode having a second width at the interface, the second width being not more than the first width, the conductive material having an upper portion with a width wider than the second width.