Patent ID: 6518071
Filing Date: 2003-02-11
Classification: H01L

Abstract:
A method of fabricating a magnetoresistive random access memory device with a taper comprising:providing a substrate with a surface; forming a dielectric region with a surface and a bottom, the dielectric region positioned on the substrate; patterning and etching through the dielectric region to the substrate to form a trench with a top width and a bottom width, the trench further including a side wherein an edge profile is formed on the side of the trench; depositing the magnetoresistive random access memory device within the trench and positioned on the substrate wherein the magnetoresistive random access a memory device has a surface and a side, the device including a first ferromagnetic region with a width positioned on the substrate, a non-ferromagnetic spacer layer with a width positioned on the first ferromagnetic region, and a second ferromagnetic region with a width positioned on the non-ferromagnetic spacer layer and wherein a gap exists between the magnetoresistive random access memory device and the side of the trench; forming the edge profile on the side of the trench such that an undesired portion of the magnetoresistive random access memory device is prevented from being deposited on the side of the trench proximate to the bottom of the dielectric region and on the surface of the substrate adjacent to the side of the trench; and depositing the magnetoresistive random access memory device wherein the taper is formed by making the width of the first ferromagnetic region greater than the width of the non-ferromagnetic spacer layer, and the width of the non-ferromagnetic spacer layer greater than the width of the second ferromagnetic region so that the first ferromagnetic region is separated from the second ferromagnetic region.