MRAM DRAM Layout Overlap for Memory Density

The patent utilizes a three-dimensional stacked architecture where memory cells are arranged in multiple layers vertically above the substrate. This vertical stacking approach increases memory density without proportionally reducing the lateral footprint, thereby avoiding the need for extreme miniaturization that would demand higher manufacturing precision. The multi-layer structure allows memory elements to be positioned at different heights, effectively using the vertical dimension to pack more storage capacity into the same planar area.

The patent implements a nested structure where capacitor patterns and magnetic tunnel junction patterns are positioned in overlapping regions, with conductive patterns routing signals through multiple layers. The capacitor patterns are formed in regions that also contain other memory structures, creating a nested arrangement where multiple functional elements occupy the same lateral space at different vertical levels. This nesting approach maximizes space utilization and increases memory density without requiring proportional reduction in feature sizes.

The patent employs a unified fabrication process that can manufacture both DRAM and MRAM devices using the same sequence of steps. The same photolithography, deposition, and etching processes are used to form both capacitor patterns and magnetic tunnel junction patterns, as well as their respective conductive interconnections. This universal manufacturing approach allows integration of different memory types without requiring separate fabrication lines or process modifications, thereby reducing overall manufacturing complexity despite the diversity of structures being produced.

The patent divides the memory array into distinct first memory areas containing DRAM capacitor patterns and second memory areas containing MRAM magnetic tunnel junction patterns. These segmented regions are independently designed and can be selectively activated or deactivated based on application requirements. The segmentation allows each memory type to be optimized independently while sharing common infrastructure such as substrate structures and fabrication processes, thereby managing complexity through modular organization.